DACs: Airport Express vs waveterminal vs mini-dac

I would really love to hear the answer to this myself because I have been trying to find information on this exact situation. Can't seem to get many answers.

We sell the waveterminal. It's used with our professional test kits. I use the waveterminal on my PC. It's very good and I've had others buy it and exclaim it's the most fantastic thing ever. I don't know about it being that fantastic, but there is no comparison to the sound cards in my computer--it's in a totally different league. Unfotunately, I can't offer you direct comparisons to the other options you mentioned.

Thanks Dschea_32665. I know it's all subjective, but without the equipment for my own comparison, it's hard to know if spending my hard-earned bucks (graduate student) on various DACs would reap the rewards of improved sonics.

So far, my GMA Europa speakers has made the biggest difference. The SACD player made a nice improvement. Having it modifled also was a nice addition. The Cayin amp also improved the sound and dynamics; I had an old NAD receiver before. I've also heard an improvement with better interconnects.

Will adding an external DAC with my computer HD as transport and music jukebox improve the sound even more? If so, at what price point? What equipment is needed to have that "better" sound? For the buck, where will I hear the most noticeable improvement?