Have you had the chance to test ride any? I've heard good things about the Ducati and the Triumph... and I like the look of the new Speed Triple... I thought the Benelli would be quite a bit more expensive than any of those choices, but I guess I'm wrong.

Personally, I like the Duke. KTM makes a great product! Of course, the Yammy is sweet... but not as sweet as their prototype.

I think the MT-O1 is considered a 'power cruiser', so it may be a bit more upright than the others (except possibly the Ducati)... though I could be wrong.

I'd at LEAST look at all of them in person, sit on them, balance them. Ask to test ride (although most places won't let you).