Like others have said, its a choice made of compromises...between things like looks, power, exclusivity, having the latest and greatest etc...
How you value each, and weight these attributes will help you make your choice, whether you make it with your head or heart.
My 749R isn't going anywhere
If you can, I'd wait at least 6 months to a year, why buy new and take the hit on depreciation?
How many 1098's will there be in the latter part of 2007....LOTS!!