Haven't tried the big V but I can say the SX is hard to beat!
The SX is an absolute dream of a bike, but speed is effortless, be warned!
First thing is change the OEM tyres, there OK for running in but after that CHANGE!
There bloody awful, you read a lot of reviews of the SX that say about the bikes problems when tipping into corners but the truth is as soon as you put different tyres on it completly changes the bike for the better and she begs to be thrown around!
Better for solo touring as the pillion perch is supermodel bum sized really.
The riding position is both touring and sporty mixed but I recommend buying foot peg lowering kit too I think all Kawasaki test riders are 5ft tall and weigh 8st! there definitely not set up for the more European sized male
the rear shock suffers for the same reason and is under sprung, a better spring and professional suspension set up will do you well. After that it's just personal taste.
The SX forum is a great place to start, it's a very active forum and loads of really helpful people on there. There's often bikes for sale too!
Good luck and let us know how you get on with test rides (and new job LOL)