Okay, let me help you out with the 6YG/6EXAS problem. The difference between them is substantial, and depending on your budget, will affect what you will need to buy for other planes later. I'll try to make this short and simple:
6YG. Fully manual radio.
It has no memory or preprogrammed mixing
It does have aileron and elevator dual rates(lets you choose between lots of control movement or little control movement at the flip of a switch) and servo reversing(lets you decide which way the servo will move when you move a control on the transmitter). It has a couple of other things, but nothing you need to worry about now

6EXAS. Computer radio.
Has 6 model memory(stores trim settings and other set up items)
FM/PCM capability(FM uses an analog signal, PCM uses signal pulses on a carrier frequency, which is less likely to get RF interference hits than FM)
Programmable mixing(mixes two or more channels together for a preset action)
Servo Reversing
End Point Adjustment(lets you set how far the servo will move when a stick is maxed out)
Dual Rate and Exponential Curve(expo lets you select how much control movement there is with little stick movement and with lots of stick movement)
It has a few other things you don't need to worry about yet

Hope that helps. My recommendation would be to stick with the 3004 servos. Mini and micro servos aren't needed for a plane the size you are looking at. Also, micro servos use a different connector than mini and standard servos, meaning you would need to get adapters or a micro receiver.
One other thought. Some speed controllers have a power outlet for the receiver. If your plane has one of these, you could save the weight of the receiver' battery pack. Just a thought