There is a way to fix the GPU issue with Apple care! I have done it successfully twice with 2 identical MacBook Pro machines:
Late 2008 Model
2.6Ghz Core 2 Duo
Nvidia 8600GT 512Mb
17" HighRes 1920x1200 display
Basically you have to completely remove the logic board from the machine, which is not too difficult. Then pre-heat your oven to 220 degrees.
Use foil, and make little legs on a baking tray.
Place the logic board, GPU up on the legs.
Put in the oven, and decrease temperature to 200 degrees.
Wait 7 minutes...
Remove, allow to cool. And re-fit, making sure EVERYTHING is properly connected.
No joke, worked both times!
The first used as a media machine is running perfectly! The second used everyday has begun to show issues, but has been under intense graphical stress a great deal more than the first.(Left 4 Dead 2 at full resolution).
There are youtube instructions! Check them out!