MMM...love C-stands but not the weight when traveling...
As far as what to look for... avoid black. They do peel after time, the only reason I have seen someone opt for a black stand is so that there's no chance of reflecting light (they shoot tabletop / micro stuff).
Look for a knuckle-lock on the shaft that you'll be comfortable with. I've seen some older Avenger and Mole stands that have a tiny plastic knob (like the folding-leg models) or a small wing nut for the shaft lock, and when you've got a heavy load up top, they're a huge pain! Lately I've been liking the locking-legs type base more than the "friction spin" on some of the Matthews (take a look at this video for a rough demo
YouTube - C-Stand by KUPO Grip)
Also here's a good one too, (turn down speakers)
YouTube - New Toy for Television & Still Photo Production