In reply to Gav Parker:
The recommendations are only my opinion, and perhaps you should go to the wall and use a wide selection to find what works the best for you. I would say though:
ATC-XP Guide, or ATC-XP if you're not bother about the guide mode, ( and dont see your self wanting it in the future).
The ATC-XP (and guide), have a smooth feed, and a a good positive grab due the v shapeed groves. It can also be rigged in a low friction mode for thicker ropes / lighter climber.
I know this might seem a little complex compared to others, but it means you will buy once and not waste your money.
Avoid things the wild country VC and VC2, as they some how manage to be to grabby when feeding whilst requiring a lot of effort to hold a climber when working routes. As they seem to be the cheapest they usually get bought by people who haven't used them before, and usually are replaced soon after.
Or some thing dead simple, functional and light as the Dmm Bug as mentioned!
Post edited at 19:10