cheers guys, i got the 6770 and another 2gb ram, thanks for all your help

Hey guys, i have the age old nerd question, what graphics card should i buy

currently have aNVIDIA GeForce 7900 GS, everything else is fine, lots of ram, decent PSU etc etc, just the graphics card needs updating

price has to be under £100, what card would you guys buy? and why? the more opinions the better. also, what websites do people buy their hardware from? thanks for the help everyone