Okay, I'm pretty much a cheapskate/luddite in this area, so my experience may not be highly relevant.

I still like Palm. My phone is a Palm Centro, and it meets my needs better than anything out there.

My deal-killer requirement is the ability to synchronize with MS Outlook (at the desktop level) WITHOUT an expensive data plan.

I still can't find anything else that does it better.

bibere usque ad hilaritatem