DOES ANYONE KNOW OF ANY SITES THAT HAVE A GOOD SELECTION OF MIDIS?

There's always VGMusic.com if you don't care about having remixes from commerical games. I'm not sure if Newgrounds has anything like that and why do I keep mentioning this site when I don't go there myself, but it might be worth a look.

You could also try this guy: Bjorn Lynne

He's got a good amount of midis and some pretty nice ones to choose from. You just have to credit him.