So being a total noob on NYC nightlife I'm wondering what's good for a small group of 4 on a Friday night? (May 15th to be specific if there's any happenings)

Ideally looking for a decent club where people dance, drinks are not overly expensive, and have a younger crowd. Music that is a bit more mixed than just all house is a plus too. And of course no business casual dress codes or anything. Were suburban white trash, not Euro-Armani types icon_cool.gif

And as a side easy to get to would be nice. Staying near Times Square - So I'm hoping subway lines stay running all night?