My CDSii sounds great in a tube system. I have heard the 5 series sounds best with Naim gear but the reference series like CDX, CDS, etc, is more flexible. I have no experience with the 5 series.
Try a Nait 5i. They sell second hand for about $1000, and there is one "sale pending" up there now. I bet it will work well in your small room. I have one driving N-Sat, which is 87 db and 6 ohm. It plays plenty loud and sounds great. I would not recommend a tube amp with your speakers, hard as they are to drive, but a Joule Electra would probably do better than anything else.
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