welly well....finally get a chance to be an expert in something around here for a change! /forums/images/graemlins/rolleyes.gif
I am a forester, and a GIS tech, so I do LOTS of maps.
Yes, the Trimble units are very expensive, but you could probably drop a bomb on a lug nut though. /forums/images/graemlins/deal.gif we've got one of those too.
My personal recomendation is the Garmin Etrex Legend. The legend has a lot of User-friendly options, comes with some base road maps with more available. It has 8 Mb of storage and is WAAS ready. As the WAAS sattalites (#33 and up) come on line (currently #35 is the only one up here) you will be getting a much higher accuracy. WAAS is Wide Area Agumentation System, and allows for differential correction of your position.
There are also some great shareware programs available for it, especially if you are an ArcView user. This one works
DNR garmin
and if your daring, or at least knowledgable enough check this one out
custom maps for garmin
The data cable is cheap enough, you can get an external antenna for you rig, and a mounting bracket for it too.
I also like the 'click stick'; it makes it very easy to use with one hand.
Hope this helps!