People have been trying to replace separates for decades, and not managed it. If you prefer separates, you will never be talked into something like a Sonos, or God forbid a Bose. However, if you want less leads, and nice looking boxes, the Sonos are the way ahead. I know people who stream kit through their TV and are happy with that.
Myself - separates, and won't be convinced any other way. Someone in work at the minute is into his technology and said that it has been proved that ITunes Lossless is just as good as CD quality, and the only thing missing is inaudible to the human ear. Well that's bollox to me, as I've listened to both, and definitely get a better sound from my hifi, and I do from an IPod (with a good vehicle for it as well).
Oh, and the shop opposite Super-Fi in Manchester is the best. Their staff are brilliant, and won't let you spend a fortune on something if they know they have a cheaper model elsewhere that will do the same job for you. I didn't get that kind of service from Super-Fi.