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@Wannabe
Good thread dredging! I was actually reading through this last night and planning to dredge it myself...
I am currently experimenting with OSM and an android phone.
If you have that available, save yourself the almost 400 notes you'd spend on the satnav.
andnav2 is the app you need off the appstore, and you can download maps so you don't need a connection.
Great for town -- just enter the address and it'll route you and do turn by turn, and if you choose to go by bike it'll prefer bike paths and back streets.
For longer rides, the best way of getting good battery life is to pick out a route at home (on the wifi or whatever), then there's an option to preload the map for that route. Do it, then turn the phone to aeroplane mode, turn wifi off etc. You can have a headphone to tell you when to turn, or you can get a barmount off fleabay for a few quid (dunno how secure this is, mine will be delivered shortly).
advantages of the 605 or 705 is the ease of use, zero hassle, the osm maps are pretty damn good for something that's free. Battery life is apparently 8hrs+, which is fine for most of us.