Don't forget the 30% rule. Take your estimate and add 30% because something always comes up.

Well, Crestron and C4 indeed are not the same product. I like C4, it is very capable, and a lot easier than crestron to do correctly. Where crestron is just about limitless, C4 can go pretty far, and future upgrades are much easier.

Your system doesn't sound that big, C4 would fit just fine as long as all of your sub systems are C4 friendly.