Hey,
I'm not an active yet, but I'm a pledge right now of a national fraternity. My advice to give to you about rush, and I'm sure other people will agree. Be yourself. Not every fraternity will be the right one for you, and chapters of fraternities are different from campus to campus. For instance, ABC fraternity might be a very strong chapter with great members at Big State U. but completely different at Cornell.
Rush is usually where you feel out the members. Remember rush is very fake. They are trying to present the best image of their fraternity they can to prospective pledges. Talk to different fraternities, especially since you don't really have a preference for one it seems. Go with the one you feel like you can be yourself and you feel welcome there. Don't go with a fraternity just because of its reputation with the girls you see at rush events (because truthfully, they're probably 'groupies' so to speak, of that particular fraternity-why else would they be at a rush event). So of course the girls at rush events are going to say that the particular fraternity is awesome - great guys, great everything. Ask girls around campus you know and trust if the opinion of the ladies matters to you.
The general rule I've heard is if you have to ask, you probably can't afford it. But dues usually aren't too expensive, if you can't afford them but you can manage your time well, you can always get a job while you're pledging. It depends on the person. Good luck
