20c vs 25c w/ 9xl, mm, on 5s
 

Would 20c work with this set up or would I be better off w/ 25c batteries.

The batteries would be either 4k 5s or 5k 5s

Go with the 25C. the price of the 25C pack is very good now and you'll sure to have better performance.

I am sure that you are refering to maxamps packs. Buy a trakpower 5s pack, 25c 4350 should be good for what you will be using it for, and will also still be light weight.

And this pack will be my next purchase this summer:intello:

Me too, looks to be just the right size and weight, plus should be good for about 25-30 mins in most of my setups! Plus the lhs is going to give me a great deal on it!