I'd stay away from the ACT clutch, it's a little too strong for your needs and it may just end up killing your tranny. I know one someone sells just a higher friction disk that retains the stock pressure plate. It's only $150. Then if you could find an extra stock pressure plate you could just have some slightly stiffer springs put in it. It would be cheaper and would suit your needs better. And as far as the extra money.....I'd like to see how much the extrude honed manifold helps out. R tires will only be good for you if you have an extra set of wheels.
later,
Nate