in many game 6800 is ahead of 6600gt but sometimes it looses.
http://www.xbitlabs.com/articles/vid...04-27gpu2.html
you want graphic card
an idea is take a card for abt 10k and save another 5k-7k and take another card for abt 10-12k after abt a yr.
but if you can afford a new card then,then consider leadtek 6600gt box oced one for nearly 12k
also,consider 256mb 6600gt asus / xfx for 14k
also,X800XL for abt 19-20k might be found lower somewhere now
also,try to find X800