While the 76 mapping version looks good and has a bigger screen and tide data, I still opted for the comparably priced eTrex Vista - the addition of an electronic compass makes it much more applicable to catamaran racing IMO. It even has a nice perpendicular to course (tacking!) right on the screen, which has helped me notice slight but persistent lifts or headers.
The Vista has a smaller screen, but more memory and an altimeter that's useful in my life off the water. In either case, get the Mapsource software - it's invaluable.
Have fun - I love techie toys!
John