The GPSMAP 60Cx (ie same unit but without sensors) is what I have and what I'd have recommended if I'd got here in time. It's not perfect for in car navigation because it doesn't have traffic updates or speech synthesis, but it's good enough for me. It's versatile and I like having a single unit that does both in-car and on-foot duties.

Nowadays I run it on rechargeable batteries. Although I have a car-kit that will run it from the cigarette lighter, that means wires trailing everywhere. I have a recharger which runs off a lighter socket in the boot, which is a better solution for me when driving. On some trips I use it a lot; when I went skiing I needed 3 pairs of batteries to cover a week, so it's worth having rechargeables.

I also carry some lithium primary AAs for emergencies. I found I had to slightly discharge them before the 60Cx would accept them because their voltage was too high (a warning/tip I got from this forum).