Im new to the gps market myself I have done a bunch or research for awhile and I think I`m going to go with the New Garmin 20 for me the new models have been broken down to a few rather than a bunch of models, the Etrex 10, 20, 30. I beleive the 10 black and white screen not sure of the options I like the 20 has color screen, waypoint, tracks your route a good memory and has memory card slot and can download Topo maps also has a compass but you have to move for it to read direction, the 30 has more options but doesn`t really seem like much more just more memory, storage space and the compass is a standing direction dont`t have to move a certain distance or speed for it to read you can stand and turn any direction and compass it operational, that feature I don`t really have to have for the price difference between the two. I have a compass in my backpack anyway.
I`m going with the 20, If I could really afford it I would go with a Garmin Rino that has the walkie talkie in it and all the gps option you`ll need but pretty expensive for me, I already carry walkie talkies.
https://buy.garmin.com/shop/shop.do?cID=145&pID=87771
Good Luck, Wildcard