I got an Acer N30 at the moment, very similar to the N35 Frogford linked, they have a slower processor, but for what I use it for (Satnav, MP3s, etc), that doesnt seem to affect anything. Bets thing by far about the Acers is they are thin, and they have USB host, so you can plug USB gps's into them, USB memory sticks, Digital cameras etc...

If I was buying a new one right now, I'd get an XDA 2s (black one), I think, they look very good

Also very impressed with my mates XDA Exec, screen is awesome, keyboard looks good, works well but a bit geeky for me .....the transcriber translation is MUCH improved over my PDA though (may be just the updated windows mobile)