I purchased a Kenwood D7A/G [1] at Ham Radio Outlet [2] today. The built-in APRS and TNC should make it a useful rig to learn amateur radio technologies.
Links:
[1] http://www.kenwood.net/indexkenwood.cfm?do=ProductDetails&ProdID=5018&Group=5
[2] http://www.hamradiooutlet.com