XT8 - selecting the right system

[kalbien]

Hi, since this is exactly the place to ask this. I would like to be sure that my plans are correct.

Xray XT8 with mount & chassis brace from Mike.
Castle Mamba Monster Combo 2200 KV
4s lipo for start 5s for racing, maybe 6s if I can handle it... (is this stupid?)
gearing is what I want to ask about. I want to use Mike slipperential, which is 46... so 11-15/46 , can you give me your suggestions?

I am waiting for mount, so nothing has been bought so far, so I can alter my selection to anything on the market (which will cost about the same)

thanks for any suggestions and cheers..