From my reading on the message boards this spring, it seems like most people recomend the Littman Cardio II or III. They say it is a little more expensive, around $90 (?) but that it is worth it. I start this fall , but I don't have this info yet from my school. I hear that some schools include them in a set in your "Book pakage", but that they aren't that good. I would think you would want a good one when you are learning. The one's we used for my physio class I coudn't hear anything out of...
You can also try them out at the med supply shop for fit etc, and then order online.t
You can do a search at the top of the page (on the yellow bar, click "search" ) of this site for stehoscopes, or anything, and get to read lots of previous advise and opinions. It is a good way to start.
I love the boards, I just saved like $1000 for an online course recomended to me from here!!!! (thanks Mystiqx