Very large room HT

Since you have limited choices for listening to new equipment, you may want to try something used from Audiogon, or a direct manufacturer with an in-home trial period. If it's Audiogon, you can always resell.

I'm a B&W fan, but they need a high-current amp to really sing. I'm not sure that best buy would have anything appropriate. There are always great options on Audiogon.

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TV..? Dude, with a room that size, you have to get a projector. I'm sure if you check the Videophile laws in your state, you'll find that it is illegal to have a room that size without a big screen and a projector.
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Used used used... for everything except the processor.

higher end speakers are cheep used and the people that buy them usually keep them well taken care of. save the money! and get better performance at the same time.

two of the larger type subs would work well. you can go new with those if you wish... the usual suspects would work great, svs, hsu , ryhmik.....etc.

can you control the light in the room? if so there is no substitute for a projector (i know you said you have a tv) you can get a real good used on e that is 1080p for CHEAP. make sure you research for the projectors and the screen to match your room.

Amps... that's a hard one, depending on your speakers.. how low the impedance goes, efficiency etc... need to know the speakers first... BUT....
parasound, b&k, anthem all make real good mulichannel amps.

i have a similar room 25' by 25'...dedicated ht, i use half for a billiard table.

my setup is...

110" Stewart filmscreen made for my projector
Sony vpl vw 60 (black pearl)
b&w 802n for the fronts
b&w htm1 center....don't skimp on the center speaker!
b&w 804S for the rears
anthem statement P5 amp
paradigm servo reference 15
marantz av8801 pre amp

send a pm if you have any questions as i do not look onto the forums that much.

Bill

My room is very similar to Mr. Baranowskis right down to the pool table, but with a 15ft cathedral ceiling and three window walls..... My concern was filling the room with good sound everywhere in it, and that was going to take sq inches of speaker cones... not little satellites

I went with a KEF Q series system after reading all the reviews and praise.... Mine is used for about 40% music (mostly vinyl), 50% TV and 10% movies. The Q900/600/800 system (about $3500 retail) is just incredible for the price... very musical, great dispersion and imaging throughout the room, and voices etc are tonally perfect. I'm using Ventura 5s for the rear surrounds as a temp solution($300 retail). I added an HSU 15F subwoofer ($1100 w shipping) to the mix to fill in the bottom end musically and for movie effects, and use an old 12" sub to even things out in the room. You would need at least two HSU 15 if you really want the movie punch everywhere. Remember that with Audyssey Equalization anything below 60 to 80htz is suppose to be sent to the subwoofer(s), so buying more expensive speakers for their low end is a bit of a waste (per Audyssey not me). You want to focus on speakers with great dispersion and accuracy for the highs, mids and upper bass...and voices especially, then get enough subwoofer(s) to get the SQL you need.... the KEFs work exceptionally well for in this regard.

You are going to need power to fill a room that size, I am running mine through a Marantz SR6005 ($1000 retail at the time) receiver not separate amps for a wife acceptance factor... easier to understand controls etc. When the time comes, I'll upgrade the receiver to their newest and best model at that time, but for now the Sr6005 works and is very musical... sounds like a Marantz... FYI the KEFs are very efficient so the 110 watts is more than enough when using the subs for everything below 60 hz.

Wife likes the looks of everything except the subwoofers, the HSU15 is large lol But she loves the sound... better than going to the movies per her.

I spent wasy less than your $20K on everything,and was still able to add a great turntable/ cartridge/ phono preamp ($4000).

In addition to your speakers, TV and receiver / amps you need to allocate for a high end blue ray player the OPPO is around $1100 a decent CD player is at least +$2000 and a seperate DAC starts at $1500 and don't forget high quality wires and interconnects where the sky is the limit figure at least $3000...... it all certainly adds up in a hurry..lol