Streamer and DAC question

Hi -

I currently use a Naim XS 2 and PSB speakers in a medium sized room. My source is streaming music through an airport express connected to the CA Dacmagic (not plus). I listed to classic rock, 80's new wave, and classical. I am obtaining a large collection of 24-192 recordings and would like to upgrade my streaming and DAC. I'm not exactly sure what sound I like but would say I lean towards a warmer sound. I can say without a doubt that I like my friend's primarily all Naim system (big amps, power supplies, wilson sophia speakers, and a dedicated room build with listening in mind...much more money than I can spend).

My brother-in-law is coming over today to help me wire my place with 10/100 cable so that I don't need to rely upon a wireless connection.

Can I connect my airport express' optical output to stream the higher bit-rate files when it is connected via the ethernet port (not wireless)?

If not, I think I would have to use a dedicated streamer. I am looking at the Moon Mind and/or Sonore Rendue. Does anyone have any experience with these products? Any others I should look at?

As far as an upgraded DAC goes...I am looking at the Rega DAC, Moon 100D, and PS Audio Nuwave. The only one I have the opportunity to listen to before purchase would be the Moon 100D. Any opinions on these DACs? Any others I should be aware? I am thinking $800 and under for the DAC.

Thanks for any input!

John