Gotta agree with those who recommend the Spyderco Military. However, let me add a couple more thoughts and options.
The Spyderco Endura. About half the cost of a Military (or less, if you like VG-10 steel), and a fine, fine slicer. If you get one of the sprint runs in ZDP-189, I think you'll have to go a very long way to find a better knife and I'm not sure you can find a better knife for the money.
The ZT0600 would be a nice choice, but it's a limited edition and you don't see many on the Exchange. Nice knife, though.
The ZT0801 has a nice fat handle (IMO), but it is just out of your price range, I think, unless you find a good deal on a used knife. Awesome knife, though. Still, you might catch one on the Exchange as people level up to the 0801CF.
Today, I am carrying the dreaded ZT0300 blackwash as my backpocket knife. If that's not big enough for you, I don't know what else to suggest.
My wildcat suggestion is a Benchmade Bone Collector, the folding knife with the walnut handle. Based on the Rift, I believe. Gorgeous knife! Under a hundred bucks at a large internet retailer.
Of course, there's always the Cold Steel Voyager.
