The Lowrance 2000C is by far the most GPS value for the dollar you can
get right now.

Several online resellers have them in the ~$700 price range right
now. (e.g. pilotshop.com = $699)

The only thing that disappoints me about the Lowrance units is that
private airstrips are not included in their Jepp database, but it's
not a show stopper for me.