Please help me with parts and setup for a new Hyper 9e build.

I'm fed up with my Savage X SS Nitro and after some research decided on a Hyper 9e buggy. Initially will be used for "bashing" (hate that term) on dirt/tarmac with the intention of joining a club in the future. Looking for a good comprimise of acceleration/top speed while avoiding overheating problems. Here's my current proposal:

- Hyper 9e (pretty much decided)
- Tekin RX8 ESC
- Tekin 2050Kv motor
- Elite RC motor mount
- 4s ????
- Airtronics MX3S (already own)

QUESTIONS:
1. Is 2050Kv motor OK given my needs? Seems like good midway point from what I've read.
2. What spur gear/pinion combo would be best for the Tekin 2050 and 4s lipo? I've read about clearance problems for some pinion gears which worries me.
3. Lipo suggestions?
4. Will the MX3S work OK?

I'm open to your advice and suggestions.
Totally new to 1/8 electric buggies so please be gentle!

Thanks, Elton.