The way to get a really hot girl to want to meet you and know more about you is to tell her that she looks "decent." And say it like you don't quite believe she's even that attractive. That's it. It will bug the **** out of he for the rest of the night and she'll search you out and want to know why you feel that way about her... because no one else does.
But to be honest I'd rather just take the super-direct route and tell her that I'm looking for a fun time and that it could be with her or it could be with someone else. If she's into it, fine. If not, then move on. And maybe leave a give/take as you walk away... lol... something like, "Oh, that's too bad. I would've thought a girl like you would know how to have fun."