Both of you make an excellent point about this list being somewhat long. I wish that I could provide a cogent argument for the inclusion of each item on the list, but the embarrassing, sad truth of the matter is that I have no idea of what I am doing.
What is important to me?
1) Quality of sound with a budget. Clearly, the former is quite subjective while I can specify the latter (<$350 or thereabouts). If it helps, some of my favourite speakers include the KEF 105 reference series, or on a budget, the Kef 103.3 reference pair. The best amp that I ever owned was the Classe A1 (magnificent for the money). I have three amplifiers at the moment: Music Fidelity B1 integrated, an old Luxman receiver (back when they were a decent choice) and an Harmon Kardon reciever (vintage between when they were okay but earlier than when they became pieces of dung). By far, I like the B1 best.
I listen to a wide variety of music but am most critical when listening to Jazz or Classical. A clear sound stage, mellow but accurate highs, crisp and controlled (even at the expense of range) bass, and lack of listener fatigue rank top among my concerns.
2)Versatility: My computer has both firewire and USB outputs, so I could go either way. I also have an HK CD player with RCA optical out, so if this device could serve double duty, that would be a nice plus.
Thank you to both for asking questions to help me to clarify what I'm trying to do.
Best,
--Patrick