For me, £3584.50 so far.
I'm sure it could have been done cheaper than that, but I've tried to be pretty honest about my expenditure and included every thing that was bought for "racing."
An excel spreadsheet detailing my costs and some more insight as to what the money was spent on and how the bike was set up can be found here -
http://kapitalmoto.co.uk/node/101 Given my initial results you may not wish to follow my set up preparation proceedure to the letter! Then again, I'm sure that the bike is fine and that the rider needs further enhancements.