What rotors to use with TTRS bbk

Hey guys, recently got a killer deal on ttrs calipers and pads. Now I need rotors. Is there another option for 370mm rotors beside the factory ones? Is there anything aftermarket or oe? Would it be possible to run a slightly smaller rotor without changing the adapters?

Or would it be better to get an adapter and run the smaller Golf R rotor?

For cost effectiveness, probably better to get an adapter to run golf r rotors. The TTRS 370 OE rotors have been going up. There is girodisc replacement but that is also $1000, i ended up just switching to stoptech st40s.