Don't know about just the rotors, but here are some nice upgrade options for the front:
993 TT caliper with 993 TT rotor.
996 TT caliper with 350 x 34 mm rotor.
Cayenne turbo caliper with 350 x 34 mm rotor.
Corvette Z-06 caliper with 355 x 32 mm rotor.
Then you can move the front callipers/rotors to the rear
'89 911 Turbo Cab
Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition