Builiding system around NOS dac

I have a NOS dac and I really love the sound (I discovered that I am allergic to fast sound or however you wish to describe it). I have head phones now and want to build a speaker sytem with this or another NOS dac. I have been reading about Harbeths and they sound great (have not heard them yet but dealer is thankfully 2 hours away). I know NOS dacs need careful system matching and was wondering if anyone could give me some info on matching components (want ss amp and have blue circle pre amp that I like) like fast speakers (Physics), or harbeths, class D or A etc?

Thanks