http://www.sonystyle.com/micros/clie/models/415.html

I'd recommend the Sony CLIE as well. I've been using a T-415 for a few months (replaced a Palm III series). It's within your budget ($220 MSRP) and has been perfect for my needs. If you just want something to use as a planner, address book,etc this fits the bill.

I also use it as a portable MP3 player, which required an audio playback adapter. It lasts several hours on a charge and the memory sticks currently come in sizes up to 128 MB.