Personally i'd like to have a car thats a bit mad based on a simple road car. That could be used for multiple uses and potentially used in the GTR class, or if they ever change it round something like a GT2, but i would like to see a road car version with lots of power and not too muh grip, so it would be a fun monster to drive but with reasonable balance.
Something like a Nissan s-body or skyline, or a Toyota supra, or a Toyota chaser/JZX100 (4 door saloon) or something roughly based on a 4 door saloon, Lexus is200, gs300/aristo, BMW 3 series or 5 series. but with a big 450bhp or so turbo 6 or V8. but with more tyre options, something akin to a performance road tyre or semi-slick like a toyo R888 or hankook RS2, yokohama advan AD07, grippy, tough but not all or nothing like a proper slick
could be attained reasonably easily with engine options/modifications etc. like an XR GTR engine in a XRT or similar. could base it on a 6 cylinder turbo engine like a skyline RB26DETT or a Toyota 1/2JZ-GTE with tuning options of 280bhp(performance around TBO class), 380bhp(fun track car/drift car, performance around the FZR) and 450bhp (crazy circuit car with little downforce/drift car, or add wings and full slicks and make it a GTR class competitor)
could be a fun get in and drive car thats a bit of a handful, be nice for drifting, as i feel we could do with more power for a fun road based car. help teach some throttle control to ready you for the top two single seaters aswel