Do any of you own, operate, or are in the market for one of those aftermarket GPS units? They are userfriendly and can realy make a difference, however, I am not sure if they are reasonable.
Garmin has a good selection of afermarket GPS units that may be used. Take a look:
Streetpilot C510
http://www.garmin.com/products/sp510/#
This one looks pretty cool:
