I have a Garmin Venture HC.....and I love it for ice fishing, i mark drop off, weed lines, ect in the summer, and it gets me within 5 feet of my mark on the ice.
This one gets great signal, compared to some other units, and is very user friendly.
I got it at dicks sporting goods for 170$. It came with US topo software, which has all the lakes,rivers,streams,contour lines, boat ramps, camping areas in the whole us. also came with all the computer cords, a beld case.
Has 24 MB of storage, I can get 98% of Maine on the internal memory card.
They were on sale for 100$ the day after Thanksgiving last year.
It is very accurate on the road, but is designed for the outdoors. I would highly recomend this unit.