The difference between a good system and a shitty system is far greater than the difference between a great system and a good system, IMO.
I have a couple of those Sonos wireless speakers now and I love the bejeezus out of them. The sound is fine, but the ability to stream all my MP3s, and Amazon Cloud Player, and radio stations from anywhere, and content from music blogs, well that's all good.
We're doing that but Bose instead of Sonos. The Lady hated my big 90s system with 4' front speakers etc and we could get a Bose with built-in AirPlay for free from Amex points. So we replaced a thing that took up the whole corner with a shelf unit that works for playing mp3s at a party which is 90% of our in-home music listening. And this way we can throw another one in the back room and have them sync up.
I was at Record Store Day and the dude in front of me was talking about his headphones and home system where he claimed he could hear where the individual members of his favorite band were standing in relation to each other.