A cunundrum of sorts... any ideas?

I have Tannoy HPD 385's (15") and I am building our forever home, and would like to utilize them in a 5.1 home theatre set-up BUT I want to use them, and only them through my Analog set-up, which will be either a Bryston 4B or a Quad both vintage through my Macintosh MX-117 vintage Pre-amp tuner.
I would like to have rear speakers and a centre speaker through a 5.1 system that has a really good DAC so I can send my signal to the Bryston or Quad, or utilize my existing DAC.
I don't want to have to spend 4 grand on new 9.1 system just to get a good centre speaker and rear speakers.
I would like to find a great older hi end 5.1 system to power the center and rears and yet be able to use my existing analog stuff so I can still play music through the Tannoys when i feel like it.
Any ideas?