The Lowrance looks like a good bargain, however note it is not waterproof.
Any of the eTrex series are pretty good. I think color is nice, but not nearly worth the price.
WAAS sounds good in theory, but in practice it's not at all useful on the road, and marginally so in the field.
Get one with a display that looks good. Tiny sucks. I like the Vista, but it all depends on what works for you. One thing to be mindful of is the base maps aren't extremely detailed. You can order software for it, but the memory is exceedingly low. I have Navteq software for my PDA, and it has all of NY,VT, ME, NH and MA installed. THat's 140 mb in maps. Not going to get that into any dedicated GPS.
This is really apples and oranges, but I mention it just so you know the limitations of these devices. As far as roaming in the wilderness, they are great. Any will get you from point A to B and back. You don't really need a map if you have coordinates. YOu just plug those in.
Have fun. PS, check out geocaching. It's pretty fun.