There are lots of sites out there. I have not used any recently because I am happy with my GPS receiver, but here are a couple I used in the past.
http://www.pocketgpsworld.com/ http://gpsinformation.net/ You can also go to a store like REI, A-16, or Sport Chalet and check out a variety of handheld units. One spends more for map capability. For hiking, loading waypoints using a map program like TOPO! works very well, in which case you can go with a much cheaper receiver.
By the way, I have not seen that many jackalopes in California. I thought maybe the cougars did them in. They seem to abound in the Midwest, though. :-)