Thanks for all the links. I'll have to dig through them.
It's really gotta be a "sports" style cassette player. I don't have a set budget, but I want a high quality model that will last and won't break if falls on the ground once and a while. My last sony (the yellow sports) walkman lasted for over 6 years of heavy and pretty abusive use.
I'm off to search the links you guys provided.