I haven't been able to find a set of NT-01's that'll fit without getting to narrow in the front. If you keep the staggered setup then it should be doable, but if you want a square setup you may have to go with something else.
I personally only have Dinan springs and Koni adj shocks and they work quite well on the track. I'm sure I'd see some improvement with coil-overs, but the car is pretty dialed in now so why spend any more money. Any money spent in this regards should pay immediate dividends once you replace the RFT's due to the spring rates he mentioned.
I also have the M3 bits in the front with Dinan plates and I'm able to get 2.4/2.7 degrees neg camber set with 1/16th of an inch toe out and turn in is really quick. For some track and DD I recommend this highly. Makes a world of difference.