I wouldn't bother with the Kawasaki because it's too vintage in execution as well as look, and if you're going down that route why not get a real old Brit classic?
You know I love the Thruxton but sometimes wonder if I'd prefer the more upright riding style of the Bonnie. They are a quite a heavy machine.
I love Guzzis and really must try a V7. They are smaller bikes, and much less powerful, but lighter too, and the look and sound ace. No idea about reliability but my colleague has a couple of 850s that he says have never gone wrong.
I looked at all three bikes last year and opted for the Kawasaki - The Guzzi is far more "vintage in execution" and I was not too impressed with build quality of the Bonnie. The Kwaka is a great bike to ride, a lot of torque at fairly low revs - pulls away nicely in any gear. Really pleased with it. Having said that, the new improved 2012 Guzzi v7, in particular the "storm" model would make the decision more difficult if I was making it now.
I looked at all three bikes last year and opted for the Kawasaki - The Guzzi is far more "vintage in execution" and I was not too impressed with build quality of the Bonnie. The Kwaka is a great bike to ride, a lot of torque at fairly low revs - pulls away nicely in any gear. Really pleased with it. Having said that, the new improved 2012 Guzzi v7, in particular the "storm" model would make the decision more difficult if I was making it now.