I'd suggest a KaBar Dozier folding hunter, which you can pick up for $25, shipping including. I think you'd be very satisfied, and you could put the remaining $25 toward the fund for the next knife (there's always another one waiting to be bought).

I carry my KaBar Dozier as often as my Benchmades & Spydercos. Heck of a knife for the money.

I've always enjoyed dealing with the folks at New Graham Knives. Here's a link, should you feel like checking them out:

http://www.newgraham.com/