I don't do voice over, but I had a Safe Sound P1 Channel Strip for a while and its feature set seems really well suited for voiceover. The pre is clean and has lots of headroom, plus it has an expander (kind of like a noise gate), which would be very helpful if you're working in an enviroment where external noises (from the outside, from a computer, etc.) could be a problem and a great and sophisticated compressor and limiter section. The limiter is almost "predictive" in that it has two stages which it will kick in depending on how much and how quickly the signal is rising in gain, which helps it to seem more transparent then most.
In terms of just a pre, I'd mostly agree with Chessrock, though I would say that if you skimp too much, you might end up with a pre that is really noisy, distorts easily or both.