Had a R 1150 GS Adventure for 5 years and 70K miles and have had my Versys for only 200 miles.
I really liked my GS but it was just too massive for me to handle when loaded up with gear, and it stood about 3 inches taller than my Versys.
It was an ABS model and had absolutly the best brakes I've ever had on a bike. Had Beemers for 25 years and I loved the motor too.
However- I personally know 5 people who have had final drive failures on their Oilhead Beemers. Its almost epidemic. If out of warranty that is a $1500. to 2000 dollar repair at a shop.
Also I travel to BMW rallies around the country in the summer and the BMW M/C dealer network is less than 150 dealers in the whole country these days and is shrinking.
Out west you can be 3 to 4 hundred miles from the nearest dealer. Theres a Kawasaki dealer in about any medium sized town if you need one.
If you haven't ridden in 3 years I think you would find the Versys a lot easier to use to build your skills back too.
I loved my Beemers since 1983 but these days I can't justify the added cost with the declining dependability.
Had about a 3 hour ride through canyons west of Denver last weekend and I think the Versys is one of the best handling, fun bikes I've ever had. Can't wait to get some more miles on it so I can open it up more!