Give Pittwater Brake and clutch a call, (they have banner ads running on the forums here)
I too am going the 330mm Rotors on my MX83 (preparation for 2JZ) and these guys were most helpful
Slotted Rotors were about $250 each - BRAND NEW
Calipers were about $50
As soon as I can find some 17's that are subtle enough - I'll be getting mine done.
*Edit* Pittwater Brake and Clucth at Narrabeen, not Narrabeen brake and clutch..
anyway - look for their banner ad on these forums