Sorry for necroing this thread as the very first post i make, but you are landed on it while googling for the DC6T and Onkyo packages - its also become very topical again due to the 'bargain' DC6T (grab em quick, shops are moving them upwards in price again).
I recently made an AV System using Onkyo's 609, Tannoy Revolution Signature DC6T Fronts, Dali Zensor 1 surrounds and Dali Vokal front.
My report is :
Excellent, i know the Onkyo is not going to make the Tannoys sing to their maximum but it does a very very good job.
If i close my eyes on the system in almost any mode involving all speakers i can pick out the Zensor side speakers almost instantly - they are not bad but they are obvious in a system like this, clarity is what they can do though, oh and believe it or not DELIVER the full range. The Tannoys and the Vokal just meld beautifully into one, the soundstage is the entirety of the room in front of you. My other half and i listened intently over the weekend and both draw the same conclusion (the other half needed to be convinced about the system anyway), the Tannoys are invisible. Even though you know where they are, the sound is not there - if you know what i mean.
I am not an excellent reviewer as i do not have the ears to truly judge systems of high level, however i do have the ears for this system and it works well. I would change the Zensor 1's - and in fact if i ever plan on doing just that i am going to go and listen to some competition. I do know the Tannoys are screaming for a good amp, and i have future plans to move into a swapping cables system and pairing the Tannoys to a very decent amp setup for pure music... but its a long way away for now.
My 2 cents - again sorry to necro the original thread but the reply belongs here.