I would add that you really have some serious choices on room layout, acoustics, projector placement, screen placement, and the rest. I have put in some really great sounding Martin Logan in wall speakers with a acoustically transparent screen and a good sub and it not only sounded great, but looked amazing when things were done. So, if you want floor standing speakers which are visible, by all means, plan for it. If you want to hide the gear, then plan for that. Lighting is the #1 thing people blow when they install a home theater (less lights is worse). They pick lousy placement for their gear, and they don't have a hard button remote control which is easy for everyone in the family to use.
It's great that you have a respectable budget, but unless you are doing this work yourself, and have the skill to do so, then I would speak to a local integrator, or actually several, and find out which one has the knowledge to ensure your money is well spent on the right gear and not overpriced gear which will fail or just be a waste of your money.