Numbers-wise, I'd lean towards the ZX-14 because as Cecil said, technology rules here, and as stated before, Suzuki is sure to update the Busa next year as a result of the ZX-14. One more thing, despite being based on the proven technology of the other Kawi bikes, it is a first year run. There may or may not be some bugs to work out. I suspect it will ultimately be the same as with the smaller bikes, nearly comparable in most categories, to which it comes down to comfort and preference. Just my $.019

Edit: BTW, I voted for the Busa because I think the Busa looks better, not because I'm a Suzuki guy. Truth be known, I'd drop the 750 in a second if I could afford one of the 2006 R1 LE's.