Viggie:
This above all else is a very personal choice. But just my opinion I would take the 6 to 8 grand you saved on the THX-Ultra2 set up and buy a very good receiver to power your new Ref 8 set up. Like I said it is very personal choice but if you indeed like the sound of Onyko why not set up to the Integra line and listen to the Integra DTR 9.9 receiver. It cost about $2000- $2200 and has settings to not only tweak each channel but each device on that channel. I demo one and liked the sound especially for H.T. I decided on Denon AVR-5308CI and love the sound with the Klipsch. The thing about Klipsch speakers is they're very unforgiving to sub-par equiptment and cabling. The Denon runs very clean and has excellent response for both H.T. and SAC listening. You can probably pick one up in the neighborhood of $5,000 and be set for a long while. But like I said it all depends on your listening habits music or movies. If I was you and I couldn't swing the Denon I'd look at the brand new ROTEL -RSX-1560. It won the best value award at CES 2009 and I personally heard it on Ref-83 and it sounded awesome. I really think this would be a good choice for you. It has 4 HDMI 1.3 inputs and supports all the lastest codecs including deep color and true D.T.S. And it uses the faroudja video processor so you can send video thru H.D.M.I without worry. Just some thoughts but don't be afraid to demo multiply units. Many dealers let you demo receivers for 30 days and you can return them and try something else until you hear something you like. Trust me you'll know. A lot of folks here will try to make you demo seperates. You can also do that but after a certain price range around 2500-2800 hundred I can't tell the difference and the new receivers all come with room adjusting dynamic parameters that do the work for you. But like I said before demo demo demo.It is very personal.
RickZler