What are your goals? Daily Driver,AutoX,Strip...What do you expect?
Run a SEARCH and ask questions to clarify anything.
OEM is the best and reliable in my opinion...who says you cant make power with OEM parts
EDIT: as for the cam gears...anything with a 4 or more bolt design ie; skunk2,JUN,etc
The reason of is to reduce the chance of slippage and poor marking(degree increments) design by inferior designs.