For Movies, I would get something like a 4K Laser Projector from Epson (LS12000) - or JVC (NZ30) if wanting something less expensive than the LS12000. Get a nice inexpensive 120"-130" giant screen from Amazon for about $300-$400. Pay Best Buy to install the PJ and Screen for another $300 labor.
For AVRs, I would get something like a Yamaha RX-A4A or Denon X3800.
Speakers and subs are a lot tougher since there are so many options available - RBH, KEF, PSB, B&W, Revel, MartinLogan, Focal, Dynaudio, Monitor Audio, etc. Definitely talk to a dealer about your best options in terms of cost. Keep in mind that with these brick and mortar brands, your dealer might be able to get you some big discounts on certain brands.