Im running Bilstien inverted dampers with H&R -35 sport springs, the only thing is the back is a touch too high!
Im sure sal will be able to help you out when he gets back.
I thought this was going to be a track mainly car? thats why i said to you that the Cup kit is the best bang for the buck as an all round package.
The spring rates for the front and rear will be different on both kits anyway, if you fit the -35mm on the rear it might be a little soft and thus tail happy, but you can correct this with thicker ARBS but its not the best way to go about it. But for track the -35 sport prings dont lower the car enough TBH, you wont get masses of roll but i would rather use lower/stiffer springs to reduce roll rather than ARBs as you run the risk of turning everything into a live axle.
Andrew