Shams --
Whichever model you get, you are looking for the most recent motherboard design which has a smaller CPU and a *slightly* smaller GPU. Someone took one apart and showed the the GPU was shrunk, but probably just a die rev to an interim 80nm size.
Regardless, the latest motheroboards use a 175Watt power supply instead of the 203W. Find one that specifies 175W on the rear of the box and you'll know you have the latest hardware. Your likeliness of failure with that unit is (anecdotally) quite small. Also note that if yours DOES fail, they will have to send you back a 175W model as they don't usually ask for the power supply...
Good luck, and man, are you in for some great games... Right out of the gate I would get Gears, Bioshock, Mass Effect, COD4, etc... Game on...
I hate trolls.
Systems I currently own: 360, PS3, Wii, DS Lite (2)
Systems I've owned: PS2, PS1, Dreamcast, Saturn, 3DO, Genesis, Gamecube, N64, SNES, NES, GBA, GB, C64, Amiga, Atari 2600 and 5200, Sega Game Gear, Vectrex, Intellivision, Pong. Yes, Pong.
