Hmm, I guess coilovers give you more setup options than the Koni's and springs. Also with coilovers you can corner weight the car. This is all well and good, bu you might wish to keep a few fillings on what is a pretty long drive to the 'Ring.
Also be wary of R888's because a wet day at the 'Ring with standing water is entirely possible and we all know how unpredictable the weather can be there. I know the 888's are okay when it's a bit wet, but there isn't much room for error at the 'Ring. Also worth bearing in mind that the car will be flat out pretty much everywhere on '888's as it has a n excess of grip already, even on F1s. Depends what you're into, but at least from my point of view, I don't think it'd be all that much fun with that setup.
I'd honestly say look at a more track biased tyre that will withstand the abuse better, but still has good water clearing ability. Something like a Bridgestone Potenza, or an S-Drive, both of which have nicely stiff sidewalls and ought not to overheat.