Hey dae do you have a 6800 currently? If so, whats the expected bump in performance? If I am getting mid 20s at best at mid-high settings in oblvion, can I expect 50-60% more? That kind of thing.
Calvin, there's an Obvlivion GPU Performance round-up over at Anandtech.com
The have an identical article for CPU performance as well. It might help you figure out what the best card is as far as bang for your buck to play oblivion with.