Here is the list of ITR cars at the moment that are in the ITR proposal. Bear in mind the formatting might be a little off, and, some of the years are wrong (we know which ones) but the final draft/edit has not been done. Personally, I think there are a lot of cars to choose from and don't see any that stand out as perfect class winners, but I do know a few I'd be interested in building!

Acura Integra Type R (98-01) DOHC I4
Acura Legend (91-95) SOHC V6
Acura RXS-S (02-04) DOHC I4
Acura TSX (04-06) DOHC I4
BMW 325i/is (92-95) DOHC I6
BMW 328i/328is (96-99) DOHC I6
BMW 330i (00-04) DOHC I6
BMW 635 (83-84) DOHC I6
BMW M3 (88-91) DOHC I4
BMW Z3 (97-00) DOHC I6
Chevy/Pontiac Camaro/Firebird (97-99) OHV V6
Ford Contour SVT (98-00) DOHC V6
Ford Mustang (99-04) SOHC V6
Ford Taurus SHO (89-95) DOHC V6
Honda Prelude (93-96) DOHC I4
Honda Prelude (97-01) DOHC I4
Honda S2000 (00-03) DOHC I4
Lexus IS300 (01-05) DOHC I6
Lexus SC300 (92-00) DOHCI6
Mazda 6 (02-04) DOHC V6
Mercedes SLK (00-03) SOHC V6
Mitsubishi 3000GT (non-turbo FWD) (91-93) DOHC V6
Nissan 300ZX (89-96) DOHC V6
Nissan Maxima (00-01) DOHC V6
Porsche 911SC (78-83) SOHC F6
Porsche 944S2 (89-91) DOHC I4
Porsche 968 (93-97) DOHC I4
Porsche Boxer (97-99) DOHC F6
Toyota Celica GTS (00-02) DOHC I4
Toyota Supra (87.5-92) DOHC I6
Toyota Supra (93-97) DOHC I6

I also think there will be room for a few other cars (notably the 94-95 Mustang GT, others too) in here but we wanted to be conservative on the first round through.

Best,
Ron