I have a Paln M130, and it's awesome. I looked at the Palm/phone unit first but decided against it because I often have to look at my schedule while talking to a client on the road, and that would be combersome using the same piece to talk on, and WRITE on. Too much swap, swap.
The M130 is under $200, has a great backlit screen, rechargable batteries and terrific software for your pc. It's the best calendar I've ever used.