I have CS5i’s in my 14.5’ X 24’ X 9’ dedicated room and they completely disappear. Your room should be great with the 5i’s. Use the Cardas room node calculator for distance of the speakers from the front wall (front baffle ~80" out from the wall) and then space them 10 feet apart center-to-center with your listening chair 10 feet from the front baffle of the speakers (equilateral triangle). Toe the speakers in such the projected centerlines from each speaker intersect 5 feet behind your head when seated in your listening position.
Nice! But you forgot the mic drop!
:^)