Here's the list of cars that are able to be race modified. Take a peak and post if you see one you would like to see included in the WRE.
Acura NSX RM '91
Chevrolet Camaro SS RM '10
Chevrolet Camaro Z28 RM '69
Chevrolet Corvette Z06 (C6) RM '06
Chevrolet Corvette ZR1 (C6) RM '09
Dodge Challenger R/T RM '70
Honda CIVIC TYPE R (EK) RM '97
Honda INTEGRA TYPE R (DC5) RM '04
Lexus IS F RM '07
Lotus Elise RM '96
Lotus Elise 111R RM '04
Mitsubishi Lancer Evolution IX GSR RM '05
Nissan SILVIA spec-R AERO (S15) RM '02
Subaru IMPREZA Sedan WRX STI spec C Type RA RM '05
Suzuki Cappuccino (EA21R) RM '95
TVR Tuscan Speed 6 RM '00
Volkswagen Golf IV GTI RM '01
I'm still leaning towards the Integra, 69 Camaro and the Lotus 111R.
Additional cars would be the ZR1 Vette, '10 Camaro and the Evo IX for rally events
You can't be the best unless you race the best.