want to buy........
graphics card with atleast 1 yr warranty........
cards like 9500gt/8600gts/hd 3850/hd 2900.........or better....
not interested in 7 series cards.....
payment upfront.......
Mate, for Rs. 3500, you could easily buy a new 9500gt ddr2 or ddr3 [depending on the brand] or a 8600gt ddr3 [Source:theitwares]. So just check the market rates first before going in for any deal, cos for your budget you should be aiming to get much better cards, if you're wanting a 2nd hand card.