Little Ninja's are awesome, but I think I'm ready for something with a little more oomph.
I'd recommend against an older R6 if you want a comfortable ride. The riding position is extremely low/forward so it's a constant push-up. These bikes are basically street legal racers. The brand new line is a bit more comfortable, but nothing like a Honda CBR. Unfortunately, just as I learned gow to skateboard on a heavy board, I've learned "the hard way" and now thw easy/light just doesn't feel right to me. I get to look forward to breaking out of that next year.
I planned on test riding most of the 600's, see which one feels most comfortable etc. The only problem is I'm only 5' 8, so it might be a little harder to find something I'm comfortable on >.>
After I've worn out whichever 600 I get (maybe a year or two after I get it), I like the look of the naked Ducati's, but they're a little (read: way) out of my price range atm.
Ducatti's are the BMWs of the motorcycle world-- needlessly over-hyped and over-priced. Plan on doing wheelies? Stoppies? Dropping your bike ever? Riding in a city with cars? My advice would be "don't ride bikes that cost more to fix than they cost used".