My "plan" was to buy a used GS over new to see if I liked these types of bike (coming from Large Sportsbikes) and then get a newer / better one if I did a couple of years later - which is about now
I originally considered a switch to the Twin Cam and thought if this coincided with the new WC jobbie there would be plenty around at good money.
My problem with all things GS is reliability, I certainly would not trust a new model from BMW, and to a lesser degree it still seems same old issues (plus a few new ones) haunt the twin cams making them a bad long term bet - expensive to run if you have to pay BMW service rates and buy warranty every year (Or risk the huge costs of a relatively likely major failure)
Anything Jap will almost certainly be pretty good for reliability, the Honda engine is nice and generally Honda's are pretty bullet proof, just hope it rides nice!
The Tenere also looks a safe bet, the Nick Saunders 50k in a few weeks is not something an early 1200GS would have managed without eating several FD's and suffering FPC / EWS issues. I am sure these will do 100k with no bother - plus easy home servicing and dealer rates half that of BMW if you don't want to do the work yourself.
Triumph are a long shot for me, servicing costs are higher and I don't trust them as much as Honda / Yamaha not to have launched a Lemon, or to provide good warranty backup - something BMW do well (but still no good if you plan to keep the bike longer than the warranty period)
I need something that won't depreciate badly if I want to swap again in two years (rules out anything brand new - but leaves room for ex-dem and one stupid owner) and will be viable to keep on the road for 5+ years if I have not got the funds to upgrade again in two years (by which time the Triumph / WC BMW should have proved themselves - or not)
The Versys is a cheapo parts bin special (yet barely any cheaper than a GS)
I think if I could afford a new bike every two years I would just buy a new GS and flog it before the warranty expires or it reaches 20k.
As it stands I reckon I will ride the Triumph and Honda, still prefer the GS and buy a Yamaha for the reliability (Plus plenty around at good money)