Another skimmer sizing question

[Sablah]

So with the Black Friday deals going on, I bought a RO Regal 200sss before they went out of stock (worst case scenario I figure I lose out on $10 returning it if it wasn't a wise decision). I have a 120g tank with a 30g sump and no fuge. I'm in the middle of converting a 40 breeder with a fuge to replace my current sump. I plan on adding a lot more fish/corals here in the next 6 months, and will be borderline overstocked. I'm not sure how much liverock I have, but it probably takes up 1/4-1/3 of my display tank. Will the 200sss be fine, or should I go down to the 150sss? I spent a long time going through the forum trying to find an answer, but I couldn't find anything relevant enough to me to not make my own post and ask for opinions.

My current stocklist:
1x Diamond watchman goby
1x Yasha goby
1x Dragonface pipefish
1x Bristletail filefish
1x Ocellaris clown
1x Eibli angel
2x Pajama cardinals.

1x Scarlet cleaner shrimp
1x Fire shrimp
1x Pistol shrimp
1x Coral Banded shrimp (I'm in the process of rehoming it, so it will be gone soon)
2x Sand-sifting starts (also in the process of rehoming, will be gone soon)
2x Peppermint shrimp
1x Pincushion urchin
1x Horseshoe crab

And some GSP that will be removed soon as well

 

[X-37B]

Checkout my build.
I have a 120 and 40 breeder, no fuge.
Can not give advice on your skimmer.
I run a Tunze 9410dc and it is golden. Never need to adjust.
Easiest skimmer cup to clean.
No need to turn off the pump when cleaning cup, feeding, or working in tank.
Has anti overflow.
If you decide to return it take a look at the Tunze as its a perfect fit for the 120.

 

[Potatohead]

I'd stick with the 200 unless you are also using a filter roller. I have 70 gallons water volume and only five fish, feed medium heavy and I have the 150 and it skims consistently without issue.