In my experiences with micro stuff I found

Hitec, JR and Futaba servos to center the best,

The Berg RX's are top Quality and super light (full Range).

I have used Castle, Viselero, and great planes ESC and all worked well.

Thunder power batteries are great but I have a few overseas batteries on the way
and will be testing them soon. 1/2 the price of TP and Flight power.

E-flite, Hacker, Axi all make great outrunners. Very reliable

Servos aside, The motor esc and batteries have to be selected on how they match.
Horizon does a good job reccomending combos, I have experienced and heard from others
that tower has a tendency to underpower their combos.