Have a look at the website for Garmin GPS units. The handheld CSx models have the latest technology...
On the Trail.
In the MN Backwaters area, because of all the water, and the potential of dropping it overboard, the 76CSx floats... The 60CSx is just as waterproof, but you'll need to tie it off on a lanyard for safety...unless you're a really good snorkeler to find it underwater.
Inside the units, the 60CSx and 76CSx are the same. Outside the units there are slight cosmetic differences, like location of buttons and the antenna.
From personal use experiences, I am way impressed with my 60CSx. It is feature rich, gets excellent reception from satellites, is conservative on batteries, has removable/expandable memory, compass works when you're standing still, and it has a color, easy-to-see screen...even when there isn't much light. When it's dark it has the standard back light viewing option to see what's on the screen.