Brake discs STOPTECH or Textar

+1 for stoptech st-40s, they're slotted 328mm rotors and 4 pot calipers. Car brakes really nice. Kept the stock rears, although had to replace calipers at about 120k as they were starting to seize. If the car sits for a few days, the rust builds up (I assume in the slots) and makes noise . Goes away after about 30-40 miles. Not sure if drilled would be better. I definitely don't regret it, but modulation from the 4-pot isn't improved the way I thought it'd be. For the same price or just a tad more I could've gone with R32/GolfR/etc. front and rear, I'd probably do that if I were to do it again.

That is not true. I have been running the StopTech BBK with 355x32 floating rotors (Z4M Coupe, 3275lbs + me) for over 2 years with 25+ track days on them and they have not warped.