The BackTrack does look interesting - do you know how big it is? I guess big enough to hold 2 AAA batteries, but I can't find any specific size information. I'm wondering how "pocketable" it is.
I know that Garmin has some lower-end hiking models that don't even have mapping capability - those would probably also fit what you're looking for. For instance, the eTrex H, which is $99.99 US.