Screen distortion and crashes

I get a lot of screen distortion, and my iMac completely freezes or crashes.  I get a video ram failure message when I run Techtool. 
I've tried reinstalling the system, but it's still happening.
I had the logic board replaced while it was under warrantee, but I'm afraid it may need replacing again (pretty expensive even to do it myself).
Any thoughts???

One good generic troubleshooting step for this is to run Applejack.
Download:
http://sourceforge.net/projects/applejack/
Article on using:
http://reviews.cnet.com/8301-13727_7-10334620-263.html?tag=mfiredir
It runs in single user mode. After installing (you won't see it in the Applications Folder) hold CMD-S at startup. You will get a black screen with MS-DOS like text. Just follow the prompts: type in "applejack AUTO" and it will run through the following:
Correct any Disk problems.
Repair Permissions.
Clear out Cache Files.
Repair/check several plist files.
Dump the VM files for a fresh start.
Trash old Log files.
You can also run tasks selectively and for specific users by typing in "applejack."
The first reboot will take much longer than usual, as it rebuilds caches. It may take several restarts to see the benefits. Because of the deep cache cleaning in AUTO mode some applications may tell you they are being opened for the first time.
I would also run the Hardware Test in extended. Disconnect all peripherals except the Keyboard and Mouse
http://support.apple.com/kb/ht1509
On your Mac, you can get to the Hardware Test simply by restarting holding down the D key.

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    com.apple.iokit.IOACPIFamily
    1.4
    com.apple.kec.pthread
    1
    com.apple.kec.corecrypto
    1.0
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    Graphics: NVIDIA GeForce GT 750M, NVIDIA GeForce GT 750M, PCIe, 2048 MB
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    Memory Module: BANK 1/DIMM0, 8 GB, DDR3, 1600 MHz, 0x02FE, 0x000000000000000000000000000000000000
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    Bluetooth: Version 4.2.3f10 13477, 3 services, 15 devices, 1 incoming serial ports
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    USB Device: Internal Memory Card Reader
    USB Device: BRCM20702 Hub
    USB Device: Bluetooth USB Host Controller
    USB Device: Apple Internal Keyboard / Trackpad
    Thunderbolt Bus: MacBook Pro, Apple Inc., 17.1

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