Just a word about size, if your planning on runnign any classic systems teh bigger you get sometimes the worse they look, right now i'm on a toshiba 46~ ish inch widescreen tv and old games like PDS dont look as good as teh would on a smaller screen.
also I would say invest some of that money on a nice stereo setup if you don't have one already. Get a nice receiver with lots of inputs plus a good speaker set. If you want a good gaming experience, you need good sound. I recommend Pioneer.