@codename_romeo
XFX 8600GT is cheaper @ 5.5k coz Rashi only have the UDF7 model of XFX8600GT which has been stopped by XFX. XFX is currently producing ony UDD3 model, which Rashi dun have.
UDF7 runs a lil hotter in temps that UDD3 nd other brands 8600GT[some 5c greater]. SO XFX 8600GT is available for cheap price. The are perfectly alrite nd perform same as other's but might be bit low on oc capability compared to toppers like UDD3, Asus EN8600GT[7k] etc
Sparkle too is a gud brand, nd u can go for it if its available for gud price[5.5k~6k]
And i wud have gone for UDF7 if i were u coz in future, if overheating limits ocing, then i can give it for warranty nd we'll get the latest model of 8600Gt at that time[maybe UDD7 or even latest].
And UDF7 is enuf for gud ocing. Just it can't be put under extreme ocing like volt modding, or bios flashing with FATAL1TY etc.