I'm not sure any of those speakers (the LCRs in particular) are really up to the task for a room that size. On top of that, those speakers are all relatively inefficient bookshelf speakers that will need a fair amount of power to get loud. I'm not sure your AVR is up to the task of driving 7 channels of inefficient speakers to high levels.
Most importantly, those bookshelf speakers are basically useless under 80Hz or so. You absolutely need a subwoofer. The Monoprice sub or a cheap Sony sub is not gonna cut it. Plan to spend at least half your speaker budget on subwoofers (you'll probably need more than one and they should match each other).
Speakers will make an enormous difference in your movie watching experience. Much more of a difference than the choice of projector or AVR. They also last a whole lot longer, so my advice is to choose wisely and invest in something good (even if you have to save up or stretch the budget somewhat). You won't regret it.
Obviously, you don't need to do it all at once, but I'd make a subwoofer a priority. 15" subwoofer minimum. Something like a HSU VTF-3 or PSA V1500.
If you want to save money, you should seriously consider going the DIY route. It will save you some money long term and it's fun to do. You can build a good 18" sub for $500 or so.
Last edited by andrewlef; 11-29-2016 at 10:44 AM.