http://www.ktechsuspension.com/products/race?field_prod_cats_nid=7 know loads of lads that race/track on these no bother with springs and valves... Just in case But like you say stock front end set up is pretty good IMO.
The valves look like a mega add on ill see how much I can get them for because I just noticed full cartridge kits from K tech start at £850
Or just look out for the 2016 forks! I know the raceteam have a pair as there using K Tech again for the TT this year, downside is your need the front wheel and the discs as there running 330's discs on the new bike... I would just try and get a good setup with what you already have, it's a well planted front end anyway....
New ones will be out of the question due to the fact they will need the brembos which im sure will be cheap haha