Re: intend to buy GTX 275
You can find these cars on sale quite often nowadays:
GTX 260 (also Core 216 version)
I'd say go with whichever of those you can find at a good deal IMHO.
1. Q6600 @ 3.2, ASUS P5Q Pro Turbo, Powercolor HD 4890 CrossFire, 4GB Mushkin DDR2-1066, 3x 24" LCD, Matrox TripleHead2Go, Audigy 2 ZS
2. Q9550 @ 3.7, ASUS P5K, Galaxy 8800GT G92, 2GB Mushkin DDR2-1066, Samsung 710N + Samsung 205BW, Audigy 2 + SB Live! 5.1 (hooked up together, really), dad's comp
3. XP-M 2500+ @ 205x11.5, Gigabyte nForce2-400, GeForce4 Ti4200, 2x512MB OCZ DDR-400 "Premier", oldie