I don't even think my light is enough for sps, but then again I think it depends on the coral. I'm going to get a radion xr30 pro for my tank sometime soon (even though I should get a mh/t5 fixture), but for now I have the maxspect razor 120 w. I personally don't think one AI prime is good enough, maybe add a second or third one. I think the AI prime is only supposed to cover 18 x 18 or something like that.
As far as the skimmer goes maybe I didnt wait long enough with mine. I got the same size one as you by the way. From what I rember the skimmer itself wasn't loud but when you put it in the chamber it's supposed to be in, it blocks the water flow which then makes a dripping/rushing water noise. The cadlights I got is pretty good, it had some micro bubbles at first but then stopped. The only annoying thing about the cadlights one is that it is very sensitive to adjustment. I think its a better skimmer overall and I belive it's overrated for this tank size. Maybe you'll have better luck with yours, but keep me updated. Ps AI will probably be coming out with that same wifi thing for all their lights. I would just leave yours for a couple of months while the tank settles.
The IM 40 is only 24x20x19, and the back 4 inches are the overflow, so it's really only a 24x16. The prime should output a center beam of 500 PAR at 12" deep, more if the coral is higher. From what I've read most SPS require 800-1000, so with two of them, and positioning the coral at 6-8" below the top, they should be fed well, no?
I'm cautious of buying anything from CADLights because of their poor support quality. I spent a few hours last night researching the ghost and the IM 40, and in early models of the ghost, they used a poor quality impeller, which would become loose and had 90-180 degrees of twist, causing the noise issues. IM responded to their customers and sent replacement parts. Additionally, in the early models there was an issue with an o-ring, which has since been deprecated and replaced with a newer model. I'm heeding your advice thought, so I'll dry fit it before I decide to keep it. I have also seen people hide a Tunze 9004 in one of the overflow filter columns, and that has solid reviews. My other concern with the CADLights skimmer is that it will stick up 3-4 inches above the tank line, and this tank is the centerpiece of my house as you walk in; it needs to be super clean, super quiet.