Warning: I am an idiot when it comes to computers Smiling

So a few weeks ago I finally took my laptop into the Geeksquad to have them fix a few things and while I was there I mentioned it had been running really slowly for awhile. Come to find out I had less than a gig of memory left on my hard drive (I guess I just figured if my ipod held all my music my computer would too.) The guy told me to get an external hard drive and put all of my stuff on that. So I bought one that was on sale and went home. While messing around with everything that night I ended up deleting my entire music collection (it was incredibly tragic.) So I returned the hard drive (money's tight and I figured I didn't need it anymore) and set about the task of rebuilding my music collection.

Well, it's two weeks later and I've managed to retrieve most of my music and am now down to 5-6 gigs of room left on my comp. I'd like to get a new external hard drive now before I use up all of my memory again but am totally lost.

Here are my questions:
-Any recommendations on type/brand of external hard drive? I'd like to upgrade my ipod so I'm thinking I shouldn't get one with less than 120 gigs of memory, but I'm also a poor recent college gradute who can't afford to spend more than 100 bucks (but spending less would be preferable if possible.)
-Any good tips on how to actually move my music to the hard drive? I never got that far the first time but the directions were really confusing to me. Do I move itunes over or just the itunes library? Will my ipod still sync to it if all my music's on the external hard drive?

Thanks for any help you can give me Smiling