This is my setup so far and I am very happy with the truck:

Front:
Stock Shock Spring
Stock Piston
Emulsion Style
35 Wt Oil
2mm front Bar
15K Diff Oil

Rear:
Stock Shock Spring
Stock Piston
Emulsion Style
30 Wt Oil
2mm Rear Bar
5K Diff Oil

Motor:
Team Epic 4.5 Turn 550 Motor
13T Pinion (32 Pitch)

The truck is amazing, it is very hooked up and turns in well. It actually drives much like a super hooked up 2WD truck. I am very happy with this setup as it jumps and lands very well.