I asked the same question not so long ago. I ended up getting a Fluke T150, which I think cost me about £50, plus another £20 for a case for it.
It's alright, it's got a self-test and automatically switches between voltage and continuity, it has a light on it and tests phase rotation, but some of the guys here prefer a reading instead of an LED lighting up.
My only real problem with it is I'd prefer a resistance reading instead of just a beep, but maybe I'm just being fussy.
I think the next tester I'll get will be the T5, like everyone else seems to have.