I have a Delorme Pn-20, which is now outdated and I think they make a pn-40 or 60 version now. When I bought it a few years ago it was the first gps that you could overlay satellite images on. It was great for creeks and little pockets of water that do not show up on a normal topo map.
My brother picked up a gps last year that I think is a little more user friendly and you can overlay satellite images also. I am not sure the brand, I'll find out tomorrow or whenever I talk to him. I don't find myself using mine as much any more. I will plug a route over a satellite image to help navigate when running new spots in the dark, but most places I know like the back of my hand. I still use it for scouting or if I am in a jam while driving, but I still do just fine with a delorme atlas on the road
I'd reccomend a delorme product. They make a nice gps, but more importantly they have some of the best topo maps. They also have some of the best customer service I have ever dealt with. When I had a problem downloading data I called customer service which was in the midwest somewhere. I think I was on hold for less then a minute before I spoke to a friendly, english speaking, knowledgable person (very rare)! He had my problem resovled in a few minutes. Having great customer service is a big winner in my book