your going to have to pick sound quality or speakers size.. that is a good sided room & would require some tower speakers to fill that room properly.
'Small' speakers have limits & are really only good for computers or super small rooms. That Onkyo HT-S6100 would not fill your sized room (best for a room about 15x15ft), you would have too really push those speakers (crank the power), that is not good for the long term use & leads to damaging the tweeter of the speaker.
Some companies make speakers that are not deep (like 5") but the width or height are more then 10" + they start at $300 each, the good ones start at $500 each.
forget wireless... they are normaly not very good sound & you still have to plug them in, they need power to work.
I need help in deciding what surround sound system to buy or whether or not to buy one at all.
Right now I have a 5.1 Sony surround system that works pretty well. The remote control no longer works, though, and it doesn't have any HDMI input/output to connect to my TV or my future Blu-ray player.
I am looking to either updrade to a new A/V receiver that has HDMI input/output or buy a whole new system. The speaker connections right now are just stripped speaker cord, so I don't know if that will be a problem with upgrading to a new A/V receiver.
If I do go the route of buying a new system, I would want something that has nice sound quality for about a 20' x 25' room (rough guess) and that does not have huge speakers that would be hard to hide (speakers preferably under 10" and possibly wireless). I was looking into getting the Onkyo HT-S6100 but I saw the 14" speakers in person and they were just too big.
Any ideas you have would be greatly appreciated. Thanks!