A deep carry clip is a must.  And always avoid exposed polished steel.  Also consider that thumb holes, as opposed to thumb studs, are great if you're ever wearing gloves.

 

That said, I suggest the Spyderco Sage 1.  It's around $110, but it's fantastic.

 

http://www.amazon.com/Spyderco-Carbon-Fiber-Plain-Knife/dp/B0013AW8Y2/ref=sr_1_1?ie=UTF8&qid=1369173158&sr=8-1&keywords=spyderco+sage

I love the small Spydercos. Top quality and neat design. Great steel. I recommend the Manbug.

 

Just be careful, they've recently gone down the road of making some of their knives in China. Fortunately they're pretty transparent about it on their web site.