Your turbo/cam combo sounds good, stick with that.
Scheides is right about thr brakes, I've never felt the 2-pistons with pads/rotors were even near "competition ready" as I'll call it. Those 13" Baer Track Kit brakes I had were awesome for the money since the kit came with calipers, SS lines, rotors, pads, and hardware.
The kit I am talking about
:
http://www.maperformance.com/baer-cl...em-1g-dsm.html
Regarding tires, I could not be happier with my Sumitomo HTRZIII's. They have very good grip, they are great in the rain, and after 3 auto-x events they are still wearing nicely. I was going to go with the Bridgestone Potenza RE750's like I put on my S2k and recommended to Scheides but they stopped making them (since been replaced by the RE760 Sports which are also supposed to be even better than the 750's, but not yet available early this spring). I started looking around at other tire options and saw that Sumitomo had this new tire out and figured I would give it a try since it was fairly untested at that point but I loved the Sumitomo HTRZII's that I had on my DSM.