I have a Garmin 76 CS. I am pretty happy with it, easy to use, good for navigation. The level of detail in the charts isn't great for halibut fishing. Good enough to get where you're going though.
I think I got it on ebay for about $200. But keep in mind if you go used, you can only use the Blue Chart CD for a certain area, then have to pay again to unlock more codes (if you do go this route, PM me for more details, as I have some info that can help you there).
One thing though, it isn't as good or easy to use as a big screen chartplotter, like Nobletec, where you pretty much following your boat on the moving map. The screen is too small for that. So you pretty much have to have your waypoints set in advance and named properly, and go direct to them. Have been lost in the fog out there a couple of times...well, not lost, knew where we were, but definitely confused. [:I]
Would I buy it again? Yes. Might be better ones out there now though.
Good luck!