FWIW, my top 5 was as follows:
(1) Kharma. (For about the tenth year running)
(2) Roksan/Monitor Audio. Those Concept 50s were a real surprise
(3) PMC/AVM
(4) Totem
(5) Zensati. Although I suspect it was the equipment making the nice noise and not the £250,000 cable loom...
Honourable mentions:
(a) Living Voice sounded nice whilst I was in there but ten minutes of solo violin was more than enough for me so I didn't hang around to see if they were any good on other material.
(b) Avantgarde Acoustics - turns out they do a brilliant job of banging dance music! Sadly they put some real instruments on after that and normal horn service was resumed so I left very quickly.
Puzzlement of the show:
(1) The Nagra room. It all looked fabulous and it sounded very nice, but how the system managed to make a dub version of UB40's 'One in Ten' sound polite and inoffensive with a pair of six foot tall speakers and two subwoofers was beyond me. I was expecting my eyeballs to rattle and my chest to be thumped to within an inch of its life!