Sure, you have to consider even audio coverage of the space, which means a couple dozen 70v speakers. At about $150 each, that's $3,600. You will need plenum rated speaker cabling and a decent amp so add $1,500 for that. $5,100 so far.. A 235" tab-tensioned electric, recessed in-ceiling screen? Plan on that being $5,000. So, a bit over $10,000. Now, you need a projector which can deliver the light output to fill a screen that is about 160 square feet. In a DARK theater, that would be about a 3,200 lumen (advertised) projector. In a typically lit (fluorescent lighting) room, that's a 12,800 lumen projector (advertised) minimum. Not meeting that specification, the cheapest quality projector is from Panasonic and rolls in a bit over $20,000...
At this point, you are at $30,000 and you don't have a single source, you don't have a wireless mic, or a mic mixer, or amplification for all of it.
Oh, and it hasn't been installed.
Forget surround sound, that's just stupid.
There are poor companies without an ounce of intelligence which will try to do it for the money you have, and you will be mad as hell when it is installed and sucks because they don't have the balls to tell you that your budget is completely off target.
What I recommend is you take the first $2,000 and higher a design company to properly design your system for you, then you take it out to bid.
You WILL want:
A good control system so that anyone can use the room without years of A/V experience. (several thousand right there)
A company with a good warranty period so that you have proper support for the first year + of service.
A company that knows what plenum cable is. No, not all of them do!
A company that is properly insured!
A budget which matches your expectations for quality.
What can you do for $20,000?
You can get just a few speakers, a far smaller screen - manual, wireless mic setup which feeds those speakers. A basic control system to run it all and a company which will install it and not screw you over.
There are 6,000 lumen projectors out there for under $5,000 which are excellent. Pair it with a 75 square foot screen - About 150" diagonal.
Cut down the number of speakers in the space and accept decent sound, not great sound. Call it a dozen speakers for $2,000
A b-stock microphone mixer can be had for a couple hundred bucks and be of very good quality.
A good amp can be had for under $1,000.
Projector mount, plenum cabling, and misc materials may be $2,000
A couple of sets of good wireless mics (2) are going to be several hundred dollars each. Call it $2,000 total.
Basic control system with iPad control or similar - $1,500
Video input plate (HDMI) $500 done properly, single connection.
Installation, programming, training, troubleshooting, drawings, project management - easily $6,000.
This is what I do for a living, and that is a somewhat closer expectation for what you might hope to get for $20,000 if you go to the right company. It will be QUALITY and will last you 10 years with proper care and no major weird system glitches or stupidity.