If you go 5 lug, you can use the aluminum calipers that came on the FD... which I happen to have an extra set for sale!

You can use the stock FD rotors or any OE sized aftermarket replacement then. 11.4"x.81" is the stock front FD rotor size IIRC.
Funny that I just got a MY02 WRX MBP. Fun little car, too bad it's gotta go to finance the FD. Would have been fun to take the scoob auto-xing....