Once upon a time one of the glossy mags did a wind tunnel comparo on the 1st gen Busa, the GSXR 1K(06, I believe), and the 06 10R (the zx14 might have been in there... I forget). It might have been Squid Rider, now that I think about it.
Anyway, they came to some neat conclusions regarding the Zook's. The Busa with proper body position was slippery... and everyone expects that. The zx10r had a lower COD WITHOUT a rider on it than the GSXR, but the COD of the Zook WENT DOWN with a rider on it, while the ZX's went up. Overall, both the Zooks had better aero's with a rider on board. However, the difference is minimal and has very little effect intil you're well into the tripple digits.
On the other hand, I've -NEVER- had any stock/similarly modded bike pull on my 10R up top... even with me on it (tall, gangly, and 190-sh suited). On many a roll-on I'm actually have to reel in a few bike lengths that GSXR's seem to pull right away. No freaking way does my bike lay down up top... Maybe the 08 isn't quite as slippery as the 06/07....?
Attack life... it's going to kill you anyway.