First of all @rhyme, ignore venur, he's comparing a 6850 with 560 ti.
And for ur doubt, yes, a gtx 560 ti twin frozr, after OCing, will mostly max out any game u can find out there 2day at 1920X1080. Plus, u wont need to OC much.
i think u should go ahead and get that gtx 560 ti.
I live in india and can understand ur currency. So my advice is to take that GPU.
Thanks dude. I think this is the best idea. After all u live in my nearest country.