For Indoors you need something about 1/24th size.
Kyosho Mini-Z are fully proportional, lots of different classes.
Buggies, saloon cars, F1 cars, 4wd, drift, Motorbikes,Trucks and people carriers.
http://en.wikipedia.org/wiki/Mini-Z
http://www.kyosho.com/eng/products/rc/index.html
Not sold widely in Uk but we do have lots of stock in warehouse.