Get a 950 SE and tick all your boxes one shot.
Weight 
Exactly.
I want to shed weight.
How can you not love this bike? 
A beaut indeed.
I am not a speed freak. My F800gs is PLENTY fast for me. In fact if I can get something slower it will actually save me money

110-130km/h cruising is perfectly fine. My mates can buy me a drinkso long when they get there 15 minutes before me.
So in the garage we have the F800GS, the 650 XCountry and my KTm 250 XCW 2 stroke.
I ride the technical and sand on my 250 now use to be on a Yamaha 250f, but then you cannot ride to destinations, you have to trailer it.
Then I briefly had a on the road KLX450R but this to me was too heavy for technical / sand bits and my skill level, and not good enough for long distance to where it excelled / gravel 1 spoor . 2 spoor etc.
And this is the whole thing. If i'm going to the quarry or juts dirt riding on my doorstep i'll take the 250 for an hour or 2 and i'm as happy as a pig in mud or if we goign to Funduro's etc we can trailer it there.
The 450 /530 for commuting and long distance makes no sense for me anymore. I thought I could make it work with the KLX450 and it was to me a failure. Oil change every 3000km,s, valve checks about the same amount, not good at all on highway, and not better for me at least than any of my 250's in the rough/sandy stuff. In any case any flicker kits etc wont last.

I ride to work every day and long distances now and then with the F800GS. Use to pillion with luggage but now that is no longer an issue since my wife has her own bike. These rides are usually 1000km's or so but usually not highway. Some highway to get to scenic passes etc, then get to some dirt highways etc. My trips consist more of the likes of Tankwa or Oasis or to Ladismith, die Hell etc,
I often ride past places I'd like to go and explore but don't due to fear of the F800gs being too heavy to go in there on my own. Plus seeing as it's my daily I don't really want to abuse it in places where it might get damaged easier than a Xchallenge / 690 etc.
I would have even considered the Husqvarna 630 but it weighs 35KG's to 40KG's more than an BMW XChallenge or KTM 690.
The other thing that comes into play here, and thats where a lot of you hardaasses will roll your eyes

- but I want switchable ABS.
Commuting in the the rain, this to me...from experience of 2 seriously close calls, not really an option to leave out of the equation.
That means a 2014 KTM 690 or a XChallenge.
There are no other bikes that I know of and weighs less than 160KG's and has a 21" front as well as switchable ABS.
The other option of course is to sit tight till end January and look at what the Husqvarna 701 Adventure / Enduro will cost. The SuperMoto is of course a KTM 690 with a few different bits. It may mean pre owned 2014/2015 690's at better prices.
The other option is to just get a pimped XChallenge.
The KTM 690 is more exciting but the Xchallenge is probably the better all round bike.
The 690 has without a doubt the better after-market farkle options
but with KTM I have to deal with KTM CT. I can purchase parts etc at RAD but Services if still in warranty then it's KTM CT or...?
The KTM has the rocker arm/bearing issues thats reported a lot. Has this been sorted in 2014 and up models that you know of?
The BMW has the clutch cover / Throwout rod issue issue thats reported a lot.
Not a lot of aftermarket farkle but has BMW support. I don't know how many have used BMW but the backup is pretty damn good. Not once so far have I been disappointed with them.
Xchallenge had a limited run and does not get made anymore but has that Rotax 650 single thats pretty good and everywhere.
Xchallenge R60K and under - this includes ABS and to get that dreadful Air shock replaced.
690 R90K up currently for 2014 and up, but that means a newer biek with less miliage. no shock work really still getting produced.
So can go Xchallenge maybe in October / November if I decide to or go KTM 690 sometime next year but start saving up in October if all goes according to plan.
Option 3. Keep my F800GS thats been very good no issues, comfy etc. The only issue really is weight.
This all came into being since we bought my wife a bike (Xcountry) and I no longer have to pillion us on trips. It now feels a bit of a waste to have the F800GS.
The question of if I want to deal with a Thumper / naked open dirtbike like feel on the road is a very valid one.
Vibrations and the dirtbike feel.
I love it.
Rode my wifes BMW Xcountry a few times now and I really love that little bike. The only place is on the highway where she needs a screen as at 120 the wind starts making you a sail. But w.r.t the motor and the power. No issues.
I've ridden 690's, Xchallenges, 450's etc and really don't mind Thumpers at all.