Reading this thread, I had an idea. (run for the hills;))
If The $xx,000 Pyramid were to be revived properly, I think that the theme should be a mix of "Tuning Up" and Cobert's theme (newly recorded so as to not sound dated, of course). For the use of the show, the main statement of Cobert's theme would be used at the show open and for Winner's Circle victories, while the portions of "Tuning Up" that don't sound "identical" to Cobert's theme would be used during commercial bumpers and the end credits. We'd get the best of both worlds this way.
BTW, I can't truly choose a favorite Pyramid theme because I've never heard "Tuning Up" in its entirety, seeing as I've never had the inclination to purchase the 2nd GSN CD.