It is true that AMD processor are faster for games. In my opinion a 128MB graphics card is good enough for any game out there, plus any future games.
I know you said you dont want to overclock but if you get yourself an AMD and overclock it a little bit at least you are getting the best performance out of your processor.
If you like quiet buy a processor (any, AMD or Intel) and a good heatsink and fan that has a manual
rpm controller, then run the CPU at stock speeds and turn the fan down to a low rpm like 1,400rpm.
Get a good heatsink and you only need to run the fan at low rpm's, whisper quiet but with very good cooling.
: Get a Sapphire 256MB
9800 Pro and change the BIOS to the 9800XT, it works.
The Radeon 9800 Pro To Radeon 9800XT Mod Guide Rev. 4.0
Read first customer review from Newegg.com