I'm not a huge fan of the combination tools, but if you're wanting a combination wire stripper/crimper, I would recommend this style:
I absolutely hate this style of stripper/crimper:
I use this style stripper myself:
Any more, I find myself crimping terminal pins 95% of the time and use ratcheting crimpers:
When I need to crimp crush type connectors (butt splices and such), I use my crimpers like what's in the second pic (I hate them, mostly because the strippers suck in them, but I got them in a basic mechanic set). I prefer having the strippers at the end of the tool, and crimpers inside the handles if using a combination type (but I don't own a set like this myself).