CRKT (Columbia River Knife & Tool) products are absolutely top notch.
Check out their hot-hot knife porn site:
http://www.crkt.com/
I highly recommend the Crawford / Kasper folder.
It's a big, heavy knife that'll handle anything you throw at it. I liked my first one so much that I bought others to store in my vehicle and for my last deployment to A-stan.
Available in two blade lengths (3" and 4") with either half-serrations or plain, straight edges. Two blade finishes: Flat black or bead-blasted (matte) steel. It has a dual fixed thumb stud with liner blade release lockout safety (LAWKS system), reversible 3-point pocket clip (anchored towards the stub choil for a quicker draw), one of the thickest liners on the market, and an ergonomic Zytel (plastic) scale handle that can handle all sorts of abuse. Lanyard hole is great for a length of cord to keep it in your pocket.
Quality construction and materials throughout. The whole package is big and heavy... and that heft gives you real confidence in it as a badass tool.
Price is right at around $45.00.
Picture example of CRKT Crawford / Kasper folder