Harbeths building system around Harbeths?


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, or harbeths etc?

Thnaks
diebenkorn
I should clarify that it was not too much power (400W/Ch)but it was a sensitivity problem of my amp and preamp not giving me much volume adjustment (the CAT preamp has a stepped volume control). I only had about 2 clicks on the volume control before it was loud. I don't think 400W/Ch is a problem but it is overkill IMO.
Have you tried the DAC1 Pre as an alternative to the SL1 Ultimate preamp? If you have, what is your impression?
I have not compared the DAC1 PRE as a preamp to my CAT preamp yet but I will. I would like to do the comparison using the balanced outputs of the DAC1 since my MC275 has balanced inputs. Currently I don't have balanced IC but I will probably borrow some from friends to do the comparison. It should be an interesting comparison.
Um, pardon my ignorance, what is an "NOS" dac? I know that a "dac" is a digital audio converter. But what does NOS mean?