I bought a Garmin eTrex Vista Hcx for pretty much the same usage you describe. I love it and would hate to give it up, but it doesn't quite work like I planned.

If I try to create a "route" (turn by turn directions) it'll often take a different way than what I programmed. I've given up on that, and put in a "track" which is just a line on the map to follow. It won't tell me of impending turns, but as long as I'm paying attention it's a great addition to having a map or cue sheet also.

I had to buy a map and handlebar mount, so even with a discounted price on the unit, I still have over $300 in it. Oh, it uses 2-AA batteries. I use some rechargeables. Battery life is (probably) less than 15 hrs, but carrying spare AAs is easy.

Good luck!