The Benchmark DAC1 Pre and the remote version come to mind.
Don't disagree on the thought of speaker upgrade. Here is the rationale:
- 12L2s sounds great out of the NAD and I was recently able to hear them driven by Bel canto 500 - sounded incredible (REL sub helps really bring out bass on orchestral music).
- I can do the benchmark, bel canto CD2 and nuforce/wyred/bel canto amp at around $6-$7k all in (a'gon purchases);
- The speaker upgrade is next - have listened to Dynaudio Confidence C2 with good class D and really incredible - $12k - next year.
FWIW - class D seems to have gotten good enough that the green side of me would not consider large wattage, large footprint class a/b.
I just got my system set up - ended up with a wyred4sound ST-500, PS Audio pre-amp (GCP-200; recently discontinued by PS Audio and was able to get cheap and new from PS Audio directly) and PS Audio DAC III with Cullen stage three upgrade (through a'gon). was also able to fine a good deal on the Quad 22L2 speakers - very incredible floor stander for the price. The sound is reallly remarkable.
thanks for thoughts/suggestions