Oh, I'm also using a budget Mio
http://shop1.outpost.com/product/499...H:MAIN_RSLT_PG
So far so good with me. It's a user's favorite because it's Windows CE based (lots of upgrades and apps available), has SD memory expansion slot(for music storage, more maps, etc), and is under $200.
Staples has the same unit for $200 to $230. If you catch one of their customer appreciation coupons (-12%), it's one heck of a deal.