I think that if my wife ever told me that she would not be riding with me ever again, I would certainly look at buying an FJR and maybe trading in the Wing. I rode a friend's FJR and WOW, WHAT A ROCKET SHIP ON TWO WHEELS!!! I know that I would have problems with comfort on IBA rides, but that is an adjustment that I would have to make if I wanted to UP the fun factor.
My friend had just about made up his mind to buy an ST-1300 but after he rode a friend's and he told him about the heat from the engine on his legs, he changed his mind to the FJR. Different strokes for different folks I guess.
With all that said, I am extremely happy with my GL-1800A. I keep up with my friend on his R1200ST and he is an accomplished rider, so don't let anyone tell you that the Gold Wing is a pig...that is unless their concept of a pig includes JATO bottles! Now if your son is a good rider and he wants to put you in the dust, his bike can do that without much effort. I seems to me that either the ST-1300 or GL-1800 will provide you adequate satisfaction for the riding you are doing.
If you test ride the GL-1800 with your wife on the back, you may find you just acquired a riding partner besides your son. But be warned...after that she will probably not be willing to get back on the back of your ST-1300 for anything other than a local ride. If you want your wife to ride with you, take her for a test ride and let her decide. You will not be disappointed with either bike.
P.S. I found your info on the Blue Sea and Garmin Rhino 530 to be very interesting. Although I already have my bike farkled like I want it, if I had know about these two items when I was in the market, I may have made different choices. Thanks.