What is a good recommendation for a good GPS unit for hiking, camping, and hunting? I don't plan to do a lot of geocaching, but want it more to help me keep from getting lost while hunting new area and to use in scouting with my son. I'd like one with Topo maps, but I dont' see many that come with very good maps installed until you get into the $300+ range in price. I'd like to stay well below that if possible...even if I have to buy maps later. Any advice is appreciated. Thanks!