[karmakazi]

You could have a contest to think up a contest... Best contest idea wins a prize! j/k

The $$$ cap would work fairly well I imagine. As long as you go by MSRP or newegg pricing for purposes of the contest. Would make AMD systems more competitive and give those people a chance.

A hardware revision/generation restriction might actually exclude some people since they might not be able to spend the dough to get a particular series card.