Andy,
I've been using the ESU CabControl system since it came out. The built-in booster is 7A. That's plenty for what you want to do. I added a second booster, also 7A which is their standard now. Overall it's a great system imho.
However there's an important caveat: I found the first version of the MCII wireless handheld throttle that's included to be a great concept but poorly executed. So did others from what I've read. It has a slow processor and runs a really old Android version: 4.1.x. The wireless connection stability and operating speed are vey poor. I sold 2 of my 3 MCIIs when my ProtoThrottles arrived and the last MCII is just for managing track power etc. No one likes to use it for ops.
But recently ESU has launched a new version of the MCII with a much faster processor, more memory and running Android 6.x. From what I've read online this solves all the issues. So I would make sure to get the new version.
Plus if you use Loksound decoders as well, you can get the benefit of Railcom.
But then you don't get NCE's great consisting feature of course. Trade-offs... 
