Unable to reinstall Mountain Lion after erasing MacBook Pro.

Hi guys,
Wondering if there are any smart techies out there willing to help me whilst I wait for Apple's support team to get back to me.
I recently (a few weeks ago) wiped my Macbook Pro (early 2011) 13" 320GB in order to resell it and now I am trying to reinstall OS in order for it to be a fully working laptop again. It originally came with Snow Leopard but I purchased Moutain Lion through the app store when it came out, I then upgraded to Mavericks and had been running that. Now that its fully erased, it gives me a few options on what to do; get online help, launch the disk utility or reinstall os Lion. The problem I have is I never purchased Lion, I only bought Mountain Lion -  so when I try going through that route it says I have bought it (obviously). Ive been through disk utility and ran all the checks, everything seems to come back fine and dandy so I am not quite sure what to do now. I don't mind reinstallion Snow Leopard or Mountain Lion or whatever, as long as it becomes a fully functioning laptop again...I can always upgrade it later on.
I would really appreciate any help on this and also I am a complete newbie when it comes to Apple products, so I would be greally grateful for any advice. I should probably add that I can't find any disks that came with the laptop, I never throw anything away but I have read that the older models came with startup disks so I have no idea what to do!
Thannk you

Please only reinstall Snow Leopard if that is the original OS that was pre-installed. You must not install any later version of OS X that you acquired because it will not work for the buyer. This also holds true for any App Store software you purchased using your Apple ID. You should not reinstall any of that software because it is useless to another owner. The following procedure will make a fresh installation of Snow Leopard that can be upgraded to 10.6.8. That's all you should provide.
Clean Install of Snow Leopard
Be sure to make a backup first because the following procedure will erase
the drive and everything on it.
     1. Boot the computer using the Snow Leopard Installer Disc or the Disc 1 that came
         with your computer.  Insert the disc into the optical drive and restart the computer.
         After the chime press and hold down the  "C" key.  Release the key when you see
         a small spinning gear appear below the dark gray Apple logo.
     2. After the installer loads select your language and click on the Continue
         button. When the menu bar appears select Disk Utility from the Utilities menu.
         After DU loads select the hard drive entry from the left side list (mfgr.'s ID and drive
         size.)  Click on the Partition tab in the DU main window.  Set the number of
         partitions to one (1) from the Partitions drop down menu, click on Options button
         and select GUID, click on OK, then set the format type to MacOS Extended
         (Journaled, if supported), then click on the Apply button.
     3. When the formatting has completed quit DU and return to the installer.  Proceed
         with the OS X installation and follow the directions included with the installer.
     4. When the installation has completed your computer will Restart into the Setup
         Assistant. Be sure you configure your initial admin account with the exact same
         username and password that you used on your old drive. After you finish Setup
         Assistant will complete the installation after which you will be running a fresh
         install of OS X.  You can now begin the update process by opening Software
         Update and installing all recommended updates to bring your installation current.
Download and install Mac OS X 10.6.8 Update Combo v1.1.
Also, see What to do before selling or giving away your Mac.

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