Engine/upgrades for DB01

[kolbaldt]

Hi Everyone!

Im pretty new to all this RC, but after reading some treads inhere i have decided to buy a tamiya DB01 or DB01R.
I cant really decide which one to buy, im abit annoyed about the fact that the 01R is missing the 501X diff upgrades and the bodyshell, so would it be best just to buy the DB01 and 2 sets of 501X diffs, + a slipper?

Also im planning to buy a Brushless setup + a LIPO battery pack for it aswell,
since there is a dealer just next to where i live who sells EZRUN BL, im planing to buy one of them, but here comes the problem...
he is selling 3 different sets, which one to buy?:
1: 9T 4300KV motor and 35A ESC
2: 8,5T 4000KV motor and 60A ESC
3: 5,5T 6000KV motor and 60A ESC

which size of Spur + Pinion gear will fit the above setup?

Any advise for a newby?
Also if there is any upgrades i should order right away?
im not gonna participate in any "pro races" just a bit of playing around on the local dirt track + skating ally.

Hope you will help me get the right parts.

Regards michael