First of all, welcome to the forum (ummm, can I welcome people? I've only been here a few months myself.....)
Anyway, you'll probably get more help if you tell us a bit more about what you're looking for. open vs. closed, what type of music you listen to, etc.
I'd take a look at sony mdr-v6s (about $55 from etronics, just a bit more than you wanted to spend) if you want some closed phones to block out surrounding noise, or if you'll be listening around others and don't want to bother them.
Also, for a cheaper alternative, check out koss's offerings, specifically the KSC-35. They can be found for $30, and are supposed to sound great for the price (I need to order a pair myself). Get them at
www.headphone.com.
I'm sure others will give some more options.
PS - buy yourself some cans and get the hell away from this forum. I was in your position a few months ago, just wanted to spend $50-$75 on some good cans, and I've ended up with 4 sets of headphones, a new cd player, md player, and an amp. And I'm not done yet.
You've been warned.