Sony Ericsson Z520i
Want a rather cheap, stylish, nice and light-weight clamshell phone that's supported in 10.4.3's iSync out of the box? Then you should definitely take a look at the Z520i. SE has upgraded their default interface with a couple of things that make life easier, such as showing the last few contacts when you're creating a new short message. I've had it for a couple of days now, and I gotta say: Certainly a nice phone.