Epochs are fully proportional, like mini-z proportional, and are 1/43 scale (Superslick scale). They will work with mini-z or any hobby grade transmitter.

I haven't got a chance to buy one yet, but I've heard many good things. The are available in the tinyrc shop. Namuna will attest to them.

While superslick cars aren't necessarily the best, I was sure happy when they got super cheap, especially all the motor kits. Their trucks are pretty good as well, though still non proportional.