I agree that motor is equivalent to a .25 to .40 glow engine.
I’ve used KR timers and Hubin timers. I like both, it’s hard to choose a favorite. One feature of the KR timer that can come in handy is the ‘prop strike’ feature. If the timer senses a prop strike it shuts down, preventing the high amps of a locked rotor and the resulting smoke show.
As for ESCs it’s hard to beat a Castle Creations Edge Lite 50. I know they’re not the lightest or the least expensive, but they can log data that you can look at, such as amp draw, to help you determine what your setup is doing. For instance, if the amp draw never exceeds 30A you can swap a Talon 35 ESC in there and save a little weight.
My Primary Force and Vector 40 both use 4S 2800 batteries. The Skyray 35 and Ringmaster use 4S 2200 batteries.
One important thing not touched upon yet is your charger. You want to consider your charger to be an investment in the health of your batteries. Spend a little money, get a quality charger, and do a bunch of reading on how to keep lipos happy. Do not exceed 80% depth of discharge (20% capacity remaining) and store them around 50% and you should enjoy good results.
I’ve settled into a comfort zone with Revolectrix chargers, Cobra motors, Castle ESCs, and ThunderPower batteries. It’s hard to choose between KR or Hubin timers, I’m still using both. I’m sure there are other brands that work well, but I have found these to all work well.