GPS
There are tons of choices out there for GPS units, so narrow down your search by determining your particular needs. Perhaps you can purchase a used or cheap unit from eBay as an intial unit.
I have a Magellan Platinum GPS unit that I transfer from the Burgman to my cars. The 128mb memory card holds plenty of mapping data. I mount the GPS on the Burgman with a RAM mount system, works great and is very easy to remove for security or vehicle transfer.
Ride on.
-Greg