Skimming this, I would caution against assuming you agree with the designer of your speakers. I did that once as a short-cut (bought a highly regarded dac that my highly regarded speaker designed also used), and ultimately didn't care for it.
If you just want something that "gets the job done", any of the DACs in this thread would do just fine. If you are curious and/or have a perfectionist streak (as many audiophiles do...), I think you just have to buy a few dacs that intrigue you (ideally used, so you don't get hosed when re-selling -- you'll lose some cash, consider that the price of your tuition) and hear them for at least a few weeks each (I'm no fan of rapid A/B switching), and see which one is best *for you*.