Im in the same boat, have been drifting for years and want to try grip.
Mine is sr with skyline box and just about evrything else. It was my daily and handled awesome through the twisties so im expecting it to be quite a competent grip car.
My last sr ceffy track car which I sold last year was striped bare with sr and full cage and at the local weigh bridge came up as 1120kg with less than 1/4 tank of fuel.