The 5k gift certificate would kick ass. But don't make it to one particular store. Instead, you might drop it in an epassporte account to be spent wherever.
I like the plasma TV idea, too. Depending on who makes it to the Superbowl, (Go Seahawks, you lazy bunch of fuckups!), the tix would also kick ass.
However, perhaps something along the lines of a pair of backstage passes to whatever concert or show the winner selects would be cool, or an all-expenses paid trip to Internext in Vegas, hotel, pass, airfare, and $1k gambling money or some such. (Don't ask me to add all that up 'cause I'm braindead right now).
Oh, the possibilities are endless here...
