I bought a Motorola Xoom off of Cowboom for Kerry to use at work this year. After getting her an upgrade for Christmas I now have the Xoom and we took it with us to Snofari.
I'm using the Backcountry Navigator program and it worked pretty awesome. Its basically an app that uses your internal GPS on top of whatever topo maps it can pull from the web. There is a premium set of maps that you can buy as well... You can create tracks like with any other GPS and it seemed pretty accurate. I'm sure there are far more features that it has than I even know about at this point.
The only real drawback with this setup is that it draws its info from the web so you either need 3g/4g/wifi or to cache the area you are going to ahead of time. Still that's not really a huge deal. For Snofari I just selected an area that was pretty much the middle of the state and downloaded it.
It was kinda neat to see the contour lines of the topo map fit perfect with some of the larger hill climbs we came across.
One big unknown for me is its compatibility with tracks made in other software. I believe there is a way to import Garmin tracks...but I don't know if it exports your tracks to a format the Garmin software can use.
The biggest plus...10" GPS screen :)
I've heard though that the Ipad running the Bad Elf GPS and the MotionX software is pretty much the cat's ass. However probably not very good for snowmobiling.
If I were to get a regular gps no doubt I'd get the Garmin Montana(650t IIRC). That seems to be the common replacement for the 276C.
Mazzola was talking about the Garmin Dezel 760LMT back at GG and now that is out. I don't know if you can load topo maps on it yet, but it's a 7" GPS. However it is designed and marketed for big rig guys.
None of that was probably of any use to you though.