Anyone have approximate values for a colossal 22x arti with stealth screen vs. one with rings (natural event)? My QSEs are limited and I'd like to get an idea of which one would sell for higher.

There was a post about it a while ago about which one was better (in Strategy) and I think the consensus was that for the time being, rings can produce more than large moons.
But I think this might change as the game goes on and gets more and better planet structures, then Large Moons will produce more, simply because it can fit more planet artifacts with like a 1 size to 3 arti ratio, for example.

Going to school now, so when I get home, I'll dig up the debate, unless someone else would like to be nice and post it before me!

Yeah I saw that one...I was asking about stealth screen though. Would it help get more production by reducing the number of cloak buildings required?

I personally value the rings a bit higher because I have no problem with putting an extra cloaking structure on it but its just my opinion if you could get rings on the stealth screen that would boost the price significantly even if you just get ruins or large moons on it still worth a lot more.