There are a lot of great suggestions in this thread.
For production knives, I'd recommend the Entrek EN1 as one that hasn't yet been mentioned.
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The Entrek is rarely mentioned on BF for some reason, but it is a terrific knife. Just got one a couple of days ago after doing a lot of looking.
It looks and feels like a newly turned out handmade knife.
Razor sharp, full tang thick 440C blade, and a great Kydex sheath.
Super quality fit, build, and finish. Grinds are excellent.
Very useful blade shape as well. And made in the USA.
This knife reminds me a lot of Barry Dawson's customs, if that helps at all.
I was looking for a small production fixed blade, and this is it. I'm hugely impressed.
http://imagehost.vendio.com/bin/vie..._link=1&track=02313afcaf-1d7d4&pt=bidpay&sp=1
In production knives there's also the Benchmade Snody Fixed Resistor which is worth checking out.
And I also
highly recommend Eddie White's (ShadowKnives) Model IX handmade.
Simply designed, beautifully turned out cutter.
(The Ontario RAT3 is a great value, but the handle is just too small for me.)