Well I ordered a 210 this week as a bundle from TigerGPS and it comes with TOPO 3D USA. I will post back on here when I get it, and let you know how much of the map I can put on the 22mb.
I own the 210. i connect it to a old laptop i had running delorme 2006. If you have someone with you to watch the gps for turns the maps from magellan work fine for a town or 2. i perfer to use the laptop bigger screen and voice prompt.