Thanks for sharing your experience. As mentioned, I will try not to look for one model only but rather choose one that will be the best deal.
As far as two cylinders vs. four are concerned, I also had bad experience with bike with four cylinders. Perhaps it was just bad luck, but my first big bike was Kawasaki GPZ600R. I was around 20 at the time and you can imagine how frustrating it was to have such a cool bike (it was at the time) and having all sort of problems with it. Few years ago I had BMW G650 XCounty (single cylinder). No problems whatsoever and even for longer rides (500 km) it was quite comfortable. So now I quite convinced that also two cylinder bike should be OK for me.