Your equipment list is all good stuff. In my opinion, Procella is a bit expensive, but it should be pretty good. For in-walls, I would look at Triad, Atlantic Technology, and KEF THX as well.
I wouldn't worry too much about room correction. I would take Dirac over Audyssey or ARC, but the results have a lot to do with the way you run the measurements, and a lot of people don't use those systems correctly. I would only use Dirac for a full-range system, but with ARC and Audyssey, I would only use those for bass frequencies. If you can not limit their operation to bass frequencies only, then don't even use them.
For screens, I would be looking at
Seymour Screens for the best acoustically transparent screens. The pricing should be reasonable too.
The SVS subs should be pretty good. Regarding XTZ, the XTZ Cinema 3x12 subs are absolute monsters. If you can get a couple of those, they would be much more powerful then the SVS 3000s, but they would also be a lot more expensive- and much larger and heavier.