Custom works is probably the most popular but the suspension can be fragile,some guys run aftermarket arms. They have a new gas sprint coming out later this summer. Klein makes a nice car that uses a gt trans. Bms makes a car that uses a hybrid gas touringcar style trans. They can be fast in some hands,not so fast in others,and some guys have been having trouble getting parts. There are others-Bullet,Bulletproof but I`ve never seen any of these here in the midwest. I build my own cars which are gt based but with much more adjustability than the kit cars. A good site to go to is www.dirtoval.com
You can ask the same question but be prepared for everybody to fight for their favorite.