I own two of the Furuno 1715 Radars--so I would consider that an endorsement. My personal feeling is that Furuno builds the best radars and fish finders (there are some speciality--such as pseudo side scan and foreward looking--in the "consumer" range which are not covered with Furuno--but their commercial rotary scan is superb).
Perhaps you should decied what cartgraphy you want to use--since they are all different--RayMarine; Navionis, The Furuno you choose; C map, and of course Garmin.
My personal preference is separate Fish finder and chart plotter. Once you start splitting up a 7" screen, there is not a lot of real estate. For about the same price, you can get a good chart plotter and separate fish finder. Which are probably as good or better than the combination.
The Garmin has been easiest to use, but you are limited to Garmin's cartography. Their fish finder in the past has not been quite up to the others, but the reports are good on the new series. But you are not comparing apples to apples in these units. The RayMarine is part of a networked system, as is the Garmin. The Garmin is the only one with a hard drive, but if you want all of the "features" you need to buy the chips also (may not be worth the aerial photos etc). The Furuno you choose is not part of the networked series. Furuno is comming out with Nav Net 3 shortly, and it may well be worth waiting for.
Because of the net vs non net, integrated vs non integrated Fish finder, the different units will have different prices.
RayMarine has the problem which is not fixed, two months later, of not picking up WAAS satellites--That may or may not be important--but we become dependant on these things...
Frankly--any of these, plus a bunch of others will do very well. There are no really bad units amoungst the top 5 or 6 brands.
I own Lowrance, Furuno, Garmin, and Standard Horizon. I am happy with all of them--and they all have some very good features.