You know, of course, this is the wrong place to ask whether or not to buy a Versys.
That said, I was also tempted by the Bandit and the FZ6 (the 600cc version of the FZ), but I already have sportbikes. The Bandit is a very good all-round bike that can do pretty much everything the Versys can, maybe better. The FZ is obviously a bit more sharply edged, but also a very good general-purpose bike.
What neither the FZ nor Bandit will give you is a fantastically lightweight bike that is very comfortable and eminently easy to use. Neither four-cylinder bike will have the easy powerband of the Versys' twin—even if it is only a 650. The Bandit and FZ probably handle better than the Versys (just as my Ducati 750ss does), but the Versys is much easier to use and have fun without pushing the bike or the rider to extremes. That alone is worth the price.
I have been riding European bikes for the past 20-ish years and one thing I have learned is that sheer performance means little if the rider is neither comfortable nor confident with his bike. For example, I ride my 350cc 1978 Moto Morini around so-called modern sport bikes up in the mountains all the time. I'm not the fastest rider around, but I can push the Morini to near 100% of ability with confidence. Doing the same on a Bandit or FZ1 would be hard to do and would frankly scare the bejeezus out of me. I am still learning my Versys, but I feel very comfortable on it and know that, even if I am not careening about as fast as others, I am having more fun and can keep it going all day without breaking a sweat. Or is that what my girlfriend said...
Geez, I need to go to bed.