Overall for price and performance the BU-353 is your best bet. The only real benefit to a bluetooth GPS receiver is that you can disconnect it and use it with a mobile phone/pda. You will still need to power it so most bluetooth receivers still need a USB port.
I have a Delorme Earthmate BT-20 which sends it's data via bluetooth, but still needs to be connected to a USB port for power (has a battery but not useful for a permanent car mounted solution). It's also not terribly accurate and has a fairly ugly-looking blue/yellow case. I'll probably be buying a BU-353 in the next few weeks.