What graphis set up should i go for?

[theslasher@ntlw]

Ok guys i have a 8800gts 640mb and i want to upgrade i play on a 22"" monitior.
Should i go for 2 9800gtx in sli and mabey use the 8800gts for physics,or go for a single 260gtx and use the 8800gte for physics.
I have a gigabyte 720w Psu will this be enoght for both set ups if so which one should i go for,i have 4gig of ram and a 6400 cpu.

[shbris]

do you have enough lanes for 3 cards at full speed?
in either case, one fast GPU is better than two slower ones, so go for 260GTX and avoid all the SLI crashes

does anyone have any benchmarks to show that the physx on seperate card actually helps? that's if anyone has bothered to buy a physx game (any 3 of them)