I use the Garmin 60CSX. Latest price check they were only a few hundred bucks at Anaconda.
They are compatable with NSW State Forests map downloads from the Game Council website too.
I'm heading to Colorado next week on a week long elk hunt. I Found a website with free topo map downlaods and downloaded the topo maps, game management units and other info and have put them on my GPS. There seems to be lots free maps compatable with garmin units.