Thanks for the extremely helpful, specific, informative, and almost frighteningly consistent

responses. This gives me a great idea of the directions in which I might want to start looking. The forum link promises to be helpful, as do the tips I've received here. From the unanimity of their recommendation, the Sennheiser HD600s look like the undisputed champions of the headphone realm for this application (If they're that good, I'm sure I'll find a way to afford them - somehow!), and I now have some idea of what it's going to take to get the sound from the disc to the headphones.
Responses to specific posts follow.
bob82274A great set of suggestions. I'm inclined to take the jewel cases rather than pack everything in a mega changer. It wouldn't be too hard to build some sort of storage cabinet for them, and I'm sort of attached to them somehow. The basic setup of Sennheiser HD600s with a headphone amp sounds good, though. Incidentally, where did you go to college? I see you're in my home state of NC.
Tonto YoderThe forum suggestion is much appreciated. It sounds like it's tailored more closely to my specific needs here - although this forum has been fantastically helpful! I also appreciate the alternate headphone suggestion. I guess it all depends on where I end up going to college. At this point, it'll probably be either Virginia Tech or MIT. I've not visited MIT yet, so I don't know which will end up being my preference when it comes to atmosphere, environment, all the things that make up "fit." If I go to VT, I'll probably get the Senns. If I go to MIT... it may be time to look at budget options. We'll see. I think I'm really starting to want those Sennheisers.
zachslcGood information about the concept of a receiver. It's also nice to know that a source selector can be easily modded into a headphone amp. I wouldn't be qualified to do that now without step-by-step guidance, but I expect to be majoring in electrical and/or computer engineering (maybe with a double major in music), so I'd probably be able to do any kind of mods by the time I wanted to. And yes, my computer speakers are the small H/K branded ones, shaped vaguely like champagne flutes and having ring-shaped oval bases and a subwoofer. They're surprisingly decent for stock computer speakers.
TysonAh, a seconding of the above recommendations - and an alternate headphone option if I need to consider it, though I've never been that big on earbuds.
Muchas gracias.
DrRastaI'll keep those recommendations in mind, but I think it's primarily a headphone setup that I need. Thanks, though.
Rob BabcockIt's a good point about the theft. Perhaps I could build the cabinet I mentioned above with a door and a place for a lock, and then if I find myself in a secure dorm with (a) trustworthy roommate(s?) then I can simply not use that feature. Fortunately, having a collection in which classical by far predominates would do much, I think, to keep honest non-classical-lovers honest. The MP3 or WAV storage on a computer is an interesting concept - but I'd really like to divorce my music from my computer completely. Besides, if I couldn't protect my CDs from theft, it wouldn't be the best place to have a set of high-end headphones. The speaker recommendation is noted, appreciated, and filed for the potential future. And congratulations on your musical tastes - I respect people who are willing to listen to diverse styles without succumbing to musical prejudice. There are too few of us!
JackStrawThanks for the link; it looks promising. Your other comments are noted.
Tonto Yoder (again)Hmm. That's an interesting comment - and certainly a financially attractive one. I'll have to look into those as well. I really need to find myself a dealer in the area and try some of these things out.