I concur with NoWire.
This is the setup I have..
1. BT-339 GPS receiver (Same as BT-338, but cheaper)
2. Arkon DM320 car kit
3. Arkon CM047-s vent kit
4. Arkon AP005 adapter plate (will need to be slightly modified so the DM320 will connect to the vent kit)
The total cost with shipping from
http://www.buygpsnow.com was 155.07. Do not forget to use your 10% discount.
You can try a free demo of Mapopolis at
http://www.mapopolis.com If you like the program the cost is $90 from
http://www.buygpsnow.com. This setup and a Starbucks coffee should bring you to about $500 or skip the coffee and it will be lowered to $250.