As long as it's a Garmin you won't go wrong. I have used a 12XL for years, i don't think they even make it any longer but it gets me in and out of the thickest woods just fine. You will be suprised at how usefull it is. I have a TOPO series map on the computer that I download all my trails and waypoints on. I have years of tree stand sites, deer trails, rub lines and parking spots on the computer map.
One bit of advice, allways carry a compass with you. Mine has never quit on me but it has run out of batteries.