I don't think the next Xbox is going to use an AMD GPU. Microsoft is in talks to acquire nVidia right now.
...the deal with Microsoft fixing your RROD for free if it's not your fault is much more attractive than paying $150+ to fix a YLOD that's not your fault. I've gone through 2 PS3s and one 360. Considering that both the YLOD and the RROD is inevitable given a certain amount of playing, I would say Sony should either make a system similar to Microsoft's or lower the price to get the PS3 repaired.
Here is the source.
http://www.informationweek....