£6ks good money p/x id say. If you havent riden an S4R - your in for a treat ! NOTHING like a 748 - Not that a 748's bad - they just make there power in very different ways.
My mate rode my tuned S4R the other day, and he reckoned it was as quick as his mates 2001 blade on the back roads..!!
Do it - you WONT regret it !!!
Cheers
Nat