The only thing I do for cheese sauce is to always add at least twice as much cheese as called for. After that, the sky's the limit - cheddar, cheddar with Habenero pepper, blue, Monterey Jack with Jalapeno, etc., etc.
I mean - who doesn't love a good baked potato?
Really - the list is only as endless as your imagination. It's an easy & fun way to feed a crowd. I mean - who doesn't love a good baked potato?
I'm with Alix on the Velveeta+cheddar+white sauce. That's the best, IMHO.