Due to our tiny wheels, for those roll'n deep on the 4.5", track tires can be a bummer to get. I did just that, and currently am sporting a D208 front D209 rear. They have 1.5 trackdays on them at RFR. I don't want to run them on the street, so if you plan on taking your bike to the track this up coming season these would be a good addition. A nice set of DOT race tires can help you prevent an incident when you make a mistake and ride a bit above your ability at the track. They stuck like glue and helped me get sub 3:00's at RFR on my 60hp monster.
I know some people love them on the street, but I wouldn't suggest it, from what I've heard it takes to much to get them warm on the street.
I'd have to go through my expenses last season to see how much they cost me, but I believe it was over 3.5 benjies... but make me an offer. I don't want to ship though, locals only.