Can't get past grey screen after update! Losing hope...

I've spent over a week trying to figure this out and about to give up... hoping that someone will reach out and try to help me resolve this. I'm seeing a lot of people with this problem, most go unsolved.
Downloaded and installed Mavericks from Mountain Lion on a Macbook Air 2012. After restart I get a grey screen (goes a little darker after a few seconds) with the Apple logo and nothing else. I can move the mouse though.
I've tried safe mode but the progress bar only goes 3/4 and then disappears and the grey screen and logo are all that remains.
Tried clearing PRAM and downloaded and installed at least 3 times now. Last time it stayed on saying that there was less than 1 minute left for over 10 minutes. Finally restarted... and brought  up the grey screen with the logo and here it is 45 min later!
Ran the disk utility on the Mavericks drive... it showed that the Mavericks drive had no repairs needed and all permissions are in order.
I do not have a backup or time capsule, so I'd really like to try to not do a clean install.
Really hope some good hearted Appleton will help me so I can be all happy with my Mac again!

Before proceeding further you should secure your data.  You are close to losing it and the instructions below will make a copy of it without having to boot the operating system.  The good news is it appears your system disk is reasonably healthy so this procedure should work.  You will need an external drive which you will erase as part of this procedure.
Boot the recovery partition:
          • Press the power button and as you hear the bong,
          hold down the Command and R keys.
          Once booted, click on Disk Utility.
Format (and erase) the destination recovery disk:
          Plug in the drive you are about to erase.
          Select the volume that is NOT your system disk.
          Click on Partition.
          Pull down under Partition Layout to 1 Partition.
          Click on Options…
          Select GUID Partition Table.
          Name: Emergency Backup
          Format: Select Mac OS Extended (journaled)
          Click Apply.
          Click Partition.
Make a copy of your system disk on the recovery disk:
          Drag and drop the named system disk to Source (often called Macintosh HD):
          Drag an drop Emergency Backup to Destination:
          (Do not reverse these.)
          Click Restore (the lower Restore button).
          Be patient for it to do a full backup of your system disk.
Then try reinstalling Mavericks from the Recovery partition.

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    0xffffff807a23b7c0 : 0xffffff7f811d6a05
    0xffffff807a23b820 : 0xffffff7f811d8b44
    0xffffff807a23b9b0 : 0xffffff7f80ff1b34
    0xffffff807a23ba30 : 0xffffff7f80fa5b35
    0xffffff807a23bb60 : 0xffffff7f80fa4b3f
    0xffffff807a23bbd0 : 0xffffff7f80ff2ba2
    0xffffff807a23bc10 : 0xffffff7f80f20522
    0xffffff807a23bca0 : 0xffffff7f80f187a3
    0xffffff807a23bce0 : 0xffffff7f80ff32f8
    0xffffff807a23bd30 : 0xffffff8000695733
    0xffffff807a23bd90 : 0xffffff80006caca5
    0xffffff807a23be00 : 0xffffff80002b60ab
    0xffffff807a23be50 : 0xffffff8000226bf1
    0xffffff807a23be80 : 0xffffff80002139f5
    0xffffff807a23bef0 : 0xffffff800021e043
    0xffffff807a23bf70 : 0xffffff80002c97bd
    0xffffff807a23bfb0 : 0xffffff80002f3b96
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    com.apple.driver.AppleFileSystemDriver          3.0.1
    com.apple.driver.XsanFilter          404
    com.apple.BootCache          35
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
    com.apple.iokit.IOAHCIBlockStorage          2.5.1
    com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
    com.apple.driver.AppleFWOHCI          4.9.9
    com.apple.driver.AppleUSBHub          666.4.0
    com.apple.driver.AirPort.Brcm4331          700.20.22
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    com.apple.driver.AppleSmartBatteryManager          161.0.0
    com.apple.driver.AppleRTC          2.0
    com.apple.driver.AppleUSBEHCI          660.4.0
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    com.apple.nvenet          2.0.21
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    com.apple.driver.AppleACPIButtons          2.0
    com.apple.driver.AppleSMBIOS          2.1
    com.apple.driver.AppleACPIEC          2.0
    com.apple.driver.AppleAPIC          1.7
    com.apple.driver.AppleIntelCPUPowerManagementClient          216.0.0
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    com.apple.nvidia.classic.NVDANV50HalTesla          8.2.4
    com.apple.nvidia.classic.NVDAResmanTesla          8.2.4
    com.apple.iokit.IOBluetoothHostControllerUSBTransport          4.2.3f10
    com.apple.driver.AppleBacklightExpert          1.0.4
    com.apple.iokit.IONDRVSupport          2.4.1
    com.apple.driver.AppleGraphicsControl          3.4.35
    com.apple.driver.AppleSMBusPCI          1.0.12d1
    com.apple.driver.AppleSMC          3.1.8
    com.apple.driver.IOPlatformPluginLegacy          1.0.0
    com.apple.driver.IOPlatformPluginFamily          5.7.0d10
    com.apple.driver.AppleSMBusController          1.0.11d1
    com.apple.iokit.IOGraphicsFamily          2.4.1
    com.apple.kext.triggers          1.0
    com.apple.driver.AppleUSBMultitouch          240.9
    com.apple.iokit.IOUSBHIDDriver          660.4.0
    com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.6.6
    com.apple.iokit.IOBDStorageFamily          1.7
    com.apple.iokit.IODVDStorageFamily          1.7.1
    com.apple.iokit.IOCDStorageFamily          1.7.1
    com.apple.driver.AppleUSBMergeNub          650.4.0
    com.apple.driver.AppleUSBComposite          656.4.1
    com.apple.iokit.IOAHCISerialATAPI          2.6.1
    com.apple.iokit.IOSCSIArchitectureModelFamily          3.6.6
    com.apple.iokit.IOFireWireFamily          4.5.5
    com.apple.driver.AppleEFINVRAM          2.0
    com.apple.iokit.IOUSBUserClient          660.4.2
    com.apple.driver.AppleEFIRuntime          2.0
    com.apple.iokit.IO80211Family          630.35
    com.apple.iokit.IOAHCIFamily          2.6.5
    com.apple.iokit.IOUSBFamily          675.4.0
    com.apple.iokit.IONetworkingFamily          3.2
    com.apple.driver.NVSMU          2.2.9
    com.apple.iokit.IOHIDFamily          2.0.0
    com.apple.iokit.IOSMBusFamily          1.1
    com.apple.security.TMSafetyNet          7
    com.apple.security.sandbox          278.11
    com.apple.kext.AppleMatch          1.0.0d1
    com.apple.iokit.IOReportFamily          23
    com.apple.driver.DiskImages          371.1
    com.apple.iokit.IOStorageFamily          1.9
    com.apple.driver.AppleKeyStore          2
    com.apple.driver.AppleFDEKeyStore          28.30
    com.apple.driver.AppleACPIPlatform          2.0
    com.apple.iokit.IOPCIFamily          2.9
    com.apple.iokit.IOACPIFamily          1.4
    com.apple.kec.pthread          1
    com.apple.kec.corecrypto          1.0
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