Hi Chrissain,
I've owned a DAC3 and I absolutely loved it. The only reason I traded it in was because I did a serious upgrade to an MBL 1611F DAC. I thought the Bel Canto sounded great with the stock power supply. I'm not familiar with the upgrade that you mentioned, however I agree with you that improving power supplies usually helps, you may be able to improve your "power delivery situation" in other ways, though.
Your used DAC3 is worth about $1600, so I don't think that I would invest another $2000 into it, you'll never be able to recover your investment. I would personally rather put that money into a Music Server or Logitech Transporter.
If I were you, I would leave the DAC3 as is, because I think it's great, and then when you're ready to jump into the Higher Resolution Audio Formats 24bit/192kHz, you could sell the DAC3 for $1600 and then add your $2000 and see what you could get in the Music Server/DAC $3000-$4000 range that can handle 24Bit/192kHz Audio.
If you want to spruce up the power to the DAC3 now, then I would invest in a nice used power cord for a couple of hundred bucks, and consider a dedicated AC-Line, that can also make a big difference.
Are you not happy with the way it sounds now?
What's the rest of your set-up like, maybe there are other areas that you could improve on?
Rich
