Welcome @Cabby - and good choice over the 390.
I bet you knew you were going to get the 790 instead within a couple miles of first riding it!
I traded in an R 1200 GS for my 790 so I know exactly what you mean about the weight and moving to lighter bikes as I get older.haha...as someone who has owned everything from Gixxer thous/R1's to GS's and AT's I'm going lower and lower capacity more from a weight perspective than a power one as moving them about the tight space I have available at my house is an issue but the fun is just as good.
The 390 was/is a hoot but that 790 was a riot and it's a second bike for me so will be a wee toy to play on.