It is my belief that you don't get the full benefit of the RAM unless you have the USB installed, because the stock, gritty plunger masks most of the effect of the RAM. And you don't get a stronger reset unless you install a stronger trigger spring.

So basically you're looking at the full DCAEK kit, plus maybe the RAM. I'd get the DCAEK first, see if it gets you where you want, and then consider the RAM.