hc4runner, in answer to your questions...
1) Very simple to use (carry spare batteries)
2) Usual accuracy is +-15ft to 20ft
3) $200 US will get you a smokin' GPS.

I would say look into the Garmin lines www.garmin.com or Magellan http://www.magellangps.com/en/

I currently own a Garmin Vista, and LOVE it. I've heard that the newest Magellans are comparable (though slightly larger).

Good Luck,

Jim.