Also ... I thought I'd elaborate a bit on one way to think about $$$ allocation.
Option 1: $3,000 on electronics, $3,000 on speakers
Option 2: $600 on electronics, $5,400 on speakers and room
'Upgrading' your electronics from 2 to 1, if the electronics in 2 are not faulty, should have no audible effect. 'Upgrading' your speakers from 1 to 2, if done right, should be a dramatic, visceral change. 25' x 12' x 20' is a big room - it would be a fantastic experience to have clean distortion-free music filling that space. To get floorstanders that fill that space with low-end authority might be stretching your budget. I think you at least consider getting a powerful pair of monitors and matching them with some tight dual subs.
I haven't bought new speakers in years, so I am not qualified to recommend any particular model, but it seems to me that the following allocation just might give you the most bang for your dollar:
Dual high power musical subs - $2500
Room treatment - $1500
Monitors - $1500
Electronics - $500
Wouldn't it would be a fantastic experiment to be able to try this both ways and see which system provided a more intense musical experience? I think this is a great thread, because $6000 is probably what a lot of people end up spending after they get all their pieces together.
What do people think is the best way to spend $1500 on mains/monitors that will blend well musically with a pair of subs, and fill a large room with distortion-free sound at highish SPL?