Yep, I agree. The e-Trex line is compact and powerfull. You may be able to find a good deal on one on ebay. I have a Vista with the monocrome lcd. Now with the color displays coming out there will be people looking for the new units.
One of the great things about the e-trex line for sledding is the compact size. They offer an inexpensive handle bar mounting kit that was originally designed for bikes that installs in about 2 minutes and is rock solid.
The higher end of the line (Summit and Vista) provide an electronic compass that allows you to know the direction your pointing without moving (something you cannot do with sat positioning) they also provide an altimeter that provides barometric presser readings. This is nice for jetting at higher altitudes.