iTunes supports almost anything sampling rate wise as long as its in ALAC IIRC, which is how I bought them from HD tracks, only issue is its telling be they are anywhere from 5,000-60,000kbps, i believe for 24/96 its 4-5000 kbps and for 24/196 its around 9000kbps, then that my E17 just says 48/16. Do E17's not do ALAC?
So I have learned that my Macbook has a digital out built into the headphone jack so I can get 24/196 to my E17 but it still says "48k 16bit", what do I need to change on my computer/iTunes to get it to 96/196k 24bit?
X1, 3, 5 and the DX50 where your original options, including every thing I would say DX90>X5>X3. The X5 and DX90 are just flat better than the others. If you want something smaller and cheaper get the X3.