Thanks. I think that 4S will be enough. I currently drive the Savage Flux on 4S and it's all the power I need, besides the Savage Flux is heavier then the RC8T-e if I'm not mistaking.
I send some people (with stuff for sale) a PM, so I'll just wait to here their prices :). I have to say that
this Tekin drives very smooth. My MMM is stuttering like crazy when I want to drive real slow.