I use a Garmin Quest. Havent seen anyone else post that they have it. I really like it--has voice prompts color maps etc. The only problem I have had with it is direction. It seems to take a while for the compass to change when I turn. I can move just a few inches and it might got from for example Northeast to southwest with a just a few degrees of turning. Dont know..maybe its me.
I also you my Treo 600 with cachemate for paperless caching, or I will just go to the site and look at the whole description that is found on the site.