I have the zv10 and it's good. Battery life is excellent. Camera is nifty and produces good quality pics.
Some quibbles with text messaging - they are short some features (such as automatic draft saving), but I guess nothing quite comes up trumps like Nokia here.
Also, make sure the phone has been flashed with the latest software. Mine can't handle streaming vids from Live! (Vodafone) and needs new software to do so, but this can't be added without losing everything (music, games, etc.) from the phone. GRRR.