I use an eTrex Vista HCx and an $11 handlebar mount. Granted, I have to use another computer for cadence and heart rate (which I already had), but for the same price as a new 705, I got the eTrex, NA Roadmaps, four states worth of topo maps, handlebar mount, dashboard mount, rechargable batteries and charger, and power adapter for the car. I can use it for hiking, biking, four wheeling, and urban navigation. It would be nice to be able to get all of my ride data in a single unit, be able just plug it into a charger rather than replace batteries, and save a few grams, but the versatility that I have with the eTrex makes up for function specific features I would get with the 705.

To mount it, I use the Garmin mount for the eTrex series and a Dashboard Genie. I have the same setup on two bikes.