The H2OC is a little less money than the ExpeditionC. For fishing, you don’t necessarily need the extra features of the ExpeditionC, but that’s up to the individual user. Most of the guys here, including myself, are running the H2OC with either the Lakemaster chip or the Navionics Premium chip. If you are only fishing in MN or only in WI, the Lakemaster chip makes the most sense. Getting the maps is as important as which GPS you choose. For fishing, a GPS without contour lake maps leaves me disappointed. Ask around and I think you’ll find that most of the folks here run a GPS with a map chip.
We do have a couple of really good package deals where you get the GPS and the map chip at a discounted price. Those packages have been incredibly popular. If you want to shoot me a PM or an email, I can link you to a couple of ideas. If you include the lakes you primarily fish, that will help me too. 