I'm trying to make a similar choice to the OP. Rode a 790 Adventure S last weekend (no problem with test rides in UK - book ahead and you can usually take a new bike for an hour). It was a blast to ride on the road. Fast, agile, smooth. Unfortunately, it is a touch low for me at 6'1". My legs would get cramp after an hour on the motorway. They didn't have an R available. The S is in stock but an R would not be delivered until September sometime. The F850GS I hadn't really considered as I thought it is a bit heavy, not a 1200 and made in China but on reflection, I think I should test ride one as 90% of my riding is on road, I sometimes take my 12 year old son as pillion and I need more luggage capacity than my current Triumph Scrambler offers. I will test the new Tiger 900 Rally as I think it looks good, is a smidge lighter than the GS (and current Scrambler) and the triple is a good USP for the road. Off-road a lot of my local stuff is single-track so I should probably get a dedicated enduro but that blows the budget to pieces! Too many choices - I'm in analysis paralysis at the moment. Maybe I should go for the 790 R but I'm a bit wary of reliability issues...all the Triumphs and BMWs I have had have been near faultless.