Cash is definitely the way to go, if you have it. Last time I bought a new bike, I had just left the Navy, and had a wad of cash I saved up. Brand new GS1100E, with money left over. That cash I saved has worked for me for almost 20 years, a good investment.
I got the Busa by more of the "white trash" method, put $800 cash on it and borrowed $8000 on my visa card, low introductory apr. By the time the interest rate jumped, I had the balance down to less than
$5000. It is now at 12.9%, which is not exactly low, but less than the bank or Suzuki would have been charging me. I might go for another low introductory apr offer, on part of what I have left, just to chase the low rate. Should have it totally paid for in less than 12 months.