Just considering the audio side of things at the moment rather than the video side. The video side is not in the 15K budget !!!

£15k left for speakers / surround controllers. I'm not saying I cant go a little further than the 15K, just wanted to see what you guys thought it would buy me in todays second hand market.

Happy to buy the best I can and wait for other parts of the system as money permits at a later date rather than just spreading the 15K across everything but would like multi channel eventually. I'd be buying once with the intention of keeping for quite some time !!!

Going to have to do a little research also as I have no idea of the differences in equipment like 818's and 861's. Also so many versions... all very complicated for a beginner !!!

Lounge : Pioneer 500A , Sky HD, KEF HTS5001.2
Living : Pioneer 600A , Sky HD , Pioneer BDP - LX70 Blue Ray, Meridian M80, Apple TV
Bedroom : 508XD, Sky HD
Sonos / B&W ceiling speakers throughout the house