In a real way I think, that "book" you’re looking for, as others here may tell you, is still being written...and some of the key chapters like any definitive description of what a true audio computer should look like and where you can buy one have scarcely even been started, so as others here suggest, you may have to find any info on that wherever you can find it and what people may post here about what they’ve come across will be helpful. I’m kind of in the same boat when it comes to computer audio, but then a lot of folks are I suspect.
For me with the issue comparatively clouded in that way for the foreseeable future, I have elected to take a few hundred bucks of what would be the overall budget for a computer audio addition to my rig and have parked it in a new Tascam solid state/CDR recorder machine which allows me to get on with wanting to make digital copies of CD’s, which allows me to copy some oop CD’s I have and then be able to sell the originals while they are still oop and are fetching higher prices...plus being able to make backup copies and my own compilation discs and so on. I have no records or tapes to archive, but the machine would allow that. It doesn’t record in 24bit, but it’s fulfilling all my needs beautifully for the money at the moment since its sound quality is excellent. I’m leaving audiophile downloads, the very best sound quality, storage, playback ease and all the rest for later on when the picture looks a little less vague or when something that everyone begins to recognize as definitive begins to take shape. When I've acquired computer audio, then I can sell the recorder, used.
But, my point is, that as you go about piecing the bits of info together you might at least consider, on your own terms, hedging your bets, so to speak, in some similar way or other that may help tide you over...or you can jump in and experiment with things, either on the cheap or with what looks like it might fly high, it’s up to you of course, but I’m just saying many people are interested in the subject right now, but lack of a clear overall direction may be par for the course these days, until something changes.
Again, I, too, am looking for anyone who will to share some of their tips.
Good luck and cheers!