What to buy xfx 4850 or asus gts 250, ATI Vs nVidia

im the AMD big fan since my 1st pc k-6

planing to buy the 4850 from xfx 2 years warranty
but the asus gts 250 with 3 years warranty

their preformance are tie or every close

http://www.tomshardware.com/charts [...] ,1535.html

Most of my game are nVidia the way it meant to be played games

i still happy with my 3850 but want to sell when it still under warranty (2 more years to go)

which is better buy?
i play CoH, CoD, NFS, C&C3, Japanese style RPG
with
e7500 3.7Ghz @ 11*333
P5KR
2*2G DDR2-800-5-5-5-15
the samsung 22" 1680*1050

Get either the XFX 5770 or the EVGA GTX 260. Both have limited lifetime warranties and will make you happy. The XFX 5770 is a lower power consumption card and is dx11 capable so I lean toward the 5770 for more future proofing...