I use a Garmin Forerunner 305 for both running and riding, and don't really plan to replace it, although the 705 is tempting. I don't really want to mount that thing on my bars however.
I really only "need" the GPS maps when I'm semi lost in an area I know (like D.C.) or when I'm in an area I don't know at all, which doesn't happen too often. I'm thinking it might be nice to carry along a general-purpose GPS device like the Garmin Nuvi, in my bag or in my jersey. I would only pull it out for a few minutes just to get my bearings and plan a route on the fly, so it wouldn't need to be on all the time.
Anybody have any suggestions? It looks like there are hundreds of different models:
Oh, I'd also use it in my car