depends how reasonable you mean. i currently have:
orange spv m1000 running tomtom navigator 3
one of
http://cgi.ebay.co.uk/ws/eBayISAPI.d...tem=5190662451 (has a ciggy charger and a port to plug in wired GPS doodahs)
one of
http://cgi.ebay.co.uk/ws/eBayISAPI.d...tem=5769693476
(bluetooth, and has ciggy charger)
works perfectly fine here