For radio gear, lighter is better.

I'm using 350mah Nimh packs in all my combat planes. A lot of guys are using AAA size 750mah Nimh cells as they last all day (I recharge between rounds. I can get 3 rounds on a charge, but prefer not to try).

For RX, you want micro and tough. Hitec is by far the most common RX in combat. The 04(something), is single conversion but very good, and cheap. (not the feather, it's a park flyer RX). I personally use a mix of Hitec 555 and Electron 6 RXs. I also have some FMA duel conversion RX's and a Polk Seeker 6. The Hitecs have proven to be the most reliable and less prone to battle damage.

For servos, I have gone micro. I use HS-81MG and HS-85MG servos in most of my planes. My P-47N's had one servo on throttle, one on elevator and one on each aileron. You can rig a single aileron servo, but I like the easier setup. Also, not having the servo stick up inside the fuse means the wing can move in a mid-air and not jam the ailerons, which is nice.

The p-47N is big enough to fit standard size gear inside though. You'll just wind up a few oz heavier. Mine were built to the old 3lb weight limit, and they just made it with an OS .25fx on mousse can.

My old P-47's (and a P-36 I picked up from who-knows-where, before I got the P-47's) (note the tape repairs on both P-47s)