Jon
Having experienced Rattler's appreciation of the R6 I am surprised you would consider this as an option.
Not that I am biased at all, but if you went for a later model 748r or rs then you would have mosty of the trick bits you need anyway. prices for anything else are coming down and ebay is your friend!
I have my r up for sale and I am thinking about the best way to sell it. If you are interested in it as a track bike we could come to an arrangement...
u2u me