Join Date: Aug 2009
Location: Western Massachusetts
Bikes: 2010 Specialized Roubaix comp (SRAM Rival), 2009 Trek 7.3FX, Early 80's steel frame Suteki road bike
Probably not a bad price for new, but you can get a refurbished 605 for about $270 on eBay, and the City Navigator SD card for about $60, just to give you something for comparison.
Edit to add: I don't have a 605 refurb myself, but I have a factory refurbished Garmin Nuvi in my car that has perfomed flawlessly, and I've not seen/read any issues with factory refurbished 605s/705s.