real rush options?

Your sister is probably right. Here's the problem. If you want to visit what you're heard are the top houses, you'd better not wait until late in the week. On the other hand, if you go to a 'top' house and get a bid and want to sit on it you may not have that opportunity.
I don't know what advice to give you. Maybe you should rank your favorites in order and then visit them in that order. Maybe someone else here can help.

There's a big difference between the way sororities recruit and the way fraternities. My advice is if you want to avoid the problem you articulated, if you think they're going to offer you a bid ask them to STOP before they get too far into it and say how much you appreciate it but you promised your girlfriend you wouldn't take any bid until Thursday night. Ask if you can come back.

Thanks PaHa. You say it's OK to wait on a bid the first night but I've heard there are fraternities, at least one, that won't let you sit. I guess you just have to play by ear.

If you get offered a bid, most fraternities will give you the option to sit on the bid, which gives you the opportunity to check out other houses or think the decision over. Do not think it is insulting to sit a bid;they totally understand. If a fraternity doesn't offer you to sit, and wants you to accept it on the spot,they're stingy,desperate, and probably not worth your time. Goodluck.