teedsman, What options do you hope to have on your GPS? Do you plan to run lake maps on it or do you just need to plot trails and points?
As some have pointed out, the Lowrance H2OC is on closeout at Cabelas for $169. That would be a good choice.
Garmin unit has some of the best accuracy out there but they are not compatible with all the map options that some other units can run. It all depends on what you plan to get out of your GPS. If you want depth contours on the GPS you’ll either have to get a unit that has lake maps preloaded (like the Garmin Colorado 400i) or you will need to make sure the GPS will accept lake map cards. The Garmin eTrex Venture HC does not have preloaded depth contours and does not accept data cards/map cards, making it a little more limited than most of us would prefer. Again, depending on what you want to do with the GPS you might want to check some other options.