PSB, NHT.

Also look at Speakercraft. They actually make the in-walls for several other companies. You should be able to demo Speakercraft at an AV store. I heard a Speakercraft/SN 965 (on which the 990 is based) set up and was very impressed - never thought such good sound could come from in-walls...
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BSMNT HT - Oppo DV-970HD,Tos HD-A2,Emo LMC-1/Onkyo TX-SR705, Outlaw 7125,PSB Image 4T 8C 10S, Outlaw LFM-1+,Panny PT-AE900U, DIY 106" fixed screen

LIVRM 2ch - Philips 963SA,Lexicon DC-1,Carver AV-505,Von Schweikert VR-2,Sony KDF-E42A10