Before your start lobbing cash willy nilly at the little fella I'd suggest that you get your front and rear suspension sorted, unless it's there already.
A rationilisation question I'd ask myself is - "am I faster than the bike or is the bike faster than me?" If it's the former and you are able to ride your bike to it's limit and the bike is now holding you back then start racing. If it's the latter then increasing it's power aint gonna help things.
Get a decent rear shock and the front re-valved and I guarantee that you will feel the difference, then and only then may you start purchasing BHP increasing goodies.
And as a tip, see if you can find a set of SP forks as they have additional adjustment.
Thats me, am out of knowledge now but I wish you a safe & successfull hunt in tracking down your quarry and dont forget to search this site...without this site i'd never have got what I have today and judging by my bank balance I wish I never had

All the breast
Jonesy