I just bought an Amigo PD-600C PocketPC device and I wanted to report to this forum the great luck I've been having with it and Ministumbler.
Basically the Amigo is an IPAQ clone, but with the benefit of having an integrated Type II PCMCIA slot, NO SLEEVE NEEDED.
New units are currently shipping for $299.00 (US) from http://www.mobileplanet.com (I have no affiliation with them, just wanted to pass on the deal!)

The Amigo website can be found at: http://www.urthere.com

Enjoy!

-langly