Eden
I have a Garmin 178C, it is a combo GPS/FF. It is my main GPS and backup FF, the FF read is from Good to Vgood............GPS is great has the blue chip which you can upgrade each year or when ever you want.........
My main FF is the Furuno 600 color, great unit, great detail........
I would suggest checking Consumers MArine Electronics Rt 34 in Wall. Best prices by far, you can go to store and kick all the tires or order online.
A little bonus, if you deceide to go with a Consumers Marine purchase, do it from MArch 16-18 (SAlt Water Fishing Expo) they offer an additional 12-20% off there prices on most units. You can order at the show or go to the store.
Last year I upgraded the GPS, FF and VHF saved an additional $400 buy ordering at the show.......hope it helps