Pro-car or universal?

[captain harlock]

Probably if you can give us a link to the website where you've seen the systems, then we might help you.
However, a better substitute would either be a Castle Creations Mamba( not Mmaba Max) system or the Tekin mini systems( on 4s, the Tekin and Mamba made some 70+mph speed runs in the mini rigs).
I've never heard about the C4( Is it a hacker?), but I know how good the Quark is. Usually a pro system means more powerful, more cell count capacities, more amp support and more $$.
Still, I would go with the Tekin Mini Rage High Performance system which includes the controller and a 6800kv motor. On 3s you'll be firing up the asphalt for sure. It costs something over $150.