Either you go with two ATi Radeon HD4850 512MB graphics cards, or you go with two nVidia GeForce 9800GTX 512MB graphics cards.
I've read a few reviews, but can't make up my mind. What would you guys do? Do you yourself have anyone of these cards, or even two, and know how well they work?
I want what will be best for gaming, and the setup which will last longer gains an advantage as well, as I do not intend on upgrading any time soon. Buying this comp will set me back lots of money, hehehe..

This is the full setup of the computer, please also say what you think of it, and say if you think it's worth roughly ~ 1540 dollars.
INTEL Core2 Quad Q6600 8MB Cache [4 cores]
8 GB DDR-2 memory Original
1000GB SATAII HDD with 7200rpm and 32MB cache
ASUS Motherboard with Intel P45 CrossFireX chipset
20x DualLayer DVD-burner
630W Silent net-something-something.. (dunno what this translates to)
CoolerMaster Dominator Gaming Chassi