I'm thinking of upgrading to a new GPS, as the Garmin 2650 I now use started acting pretty weird on my last trip, and is not that easy to see in sunlight. I'm thinking about either a 660 or 665. Are they brighter than the old ones? How many Bluetooth devices can you connect to it? I was thinking of doing a bluetooth radar detecter unit along with phone if that's possible. Does stuff pair well with this unit? I know the 665 has the XM capability, but what are subscription costs per month for the radio, weather, and traffic features? The problem with that is I only need it for a few months a year, and they want to charge you all year for it. I wish XM would come up with a chip or something so that I could take it and put it in my car XM receiver so I don't have to pay a second subscription for that. I know I could just mount the unit in the car, but I already have built in stuff and I'd rather use that. As far as the MP3 player, is there internal memory for that, or is that all stored on a card? How big a card does it accept? Do the new units use map source software or is there new software for that? How are they at drawing maps on using specific routes you want to take? I always found it necessary to draw maps up on the computer if I wanted to pick and choose the roads I wanted to take as the unit would route me on whatever roads it chose depending on what routing preferences I chose, instead of the exact roads I wanted. Can I do this directly on the new units as that would be handy if I didn't have a computer handy. If not, can I connect to a computer through Bluetooth or wireless to download routes or does it have to be hooked up with a cable? Overall, how happy are most users happy with these units?