You picked a great buggy, I personally prefer the hitec, both are good I feel hitec if a little better servo. You can still use the faast system becouse it is a digital servo. Again I MUCH prefer life batt over lipo for a couple reasons...on reciever pks you get a little higher voltage that helps your servos out and you get many more cycles out of them than lipo. on a regular pack a lipo will last around 250 cycles and about 1000 for a life pk. Now if you ever convert to brushless, you can get about the same speed and endurance as a lipo with some simple regearing.