I need some help choosing a lipo... and some set up..

So i think i have found what i want tell me what you all think....

ProTek R/C 5S Li-Poly 20C Battery Pack (18.5V/4000mAh) 82.99*2 165.98

Hyperion EOS 0610i Net Li/NiMH/A123 Balancing Charger (6S/10A/250W) 169.99

Castle Creations Mamba Monster ESC. 169.95

Feigao 540XL - 10XL Brushless Motor (10trn, 5mm shaft, 66A, 1668kv)
[540840-10XL] $69.95 i think this is the right one if i am wrong pls tell me...

RC-Monster Brushless Motor Heatsink/Clamp (Feigao XL size, silver, CNC aluminum) 33.95

RC-Monster Battery Tray (Flight Power/Poly Quest, 5000 size, plastic, black)
[RCM-BTTY-TRY] $39.95

RC-Monster Electric Motor Mount (CNC aluminum, Kyosho 44.95

5mm bore, mod1 pinion 12.00 not sure which one to get.