How about none? They remake movies because they know they will make money off of young people that never saw the originals, and old fans that want to see it in a different way.
The movie producers really need to come up with some somewhat original concepts, as it's getting kind of ridiculous. Just let the old movies die off, and come up with some new stuff instead. If some old farts want to watch the originals, then that's what DVD's and such are for. >_<
The only movies that I think should be redone are ones that had a good concept, but were terribly done. The only problem with that is, the movie producers would probably never get funding for it.
/rant >_<