Well as dead as this topic seems I'd like to add some input. I am from sunny South Africa so if by any chance someone from 'South Fricana' (check the qfg3 guide) happens to be in the game, I'm your man. I can also do a handful of accents and have a good sound card etc so quality would not be too shabby either.
If you're gonna do a speech pack do it right - please. There's nothing worse than lame voices in an otherwise good game, they detract from the overall atmosphere and just lead to people turning them off.