I would also say the M130 is a good buy. The Zire I would avoid, 2 megs would fill up in a sec (unless all you plan on doing is using datebook). I would rather get an M105 for a few bucks more and get the 8 megs.
Yuck, m105's. My dad has one, and compared to my Visor Edge, the thing is really cheezy and uses AA batteries. Careful, you can still get a decent palm for a low price.