Re: CD, SACD & DVD-A
First, I don't believe there are SACD or DVD-A drives available for your PC, so that may be out the window. Second, if you want ideal transfers from LPs you don't want a compressed format, and unfortunately, only compressed formats (MP3, AAC, etc.) allow you to have data associated with your tracks. If you had a Mac you could convert files into Apple lossless (which does allow track info), but even that wouldn't matter as you cannot record directly to the Apple lossless format, because it's only available in iTunes which has no recording capability. In any event, Apple Lossless is no better than CD (16 bit/44 kHz) quality, and it seems you want better.
That leaves 96 bit/192kHz digital transfers, which are only playable on a computer (because consumer audio hardware can't read the data files) and have no track info. Your recording software choice would determine whether you can record with these settings, and software varies by price, technical capability and region of the world you live in. From what I know, this is by far the most accurate spec for recording digitally, probably better than your LP source recordings even provide.
I will mention finally that unless you have very high-end computer components, the quality of your sound conversions will be colored by your computer's noisy power circuits. This is why many people who want ultra-high quality digital audio buy outboard hardware such as Creative Labs Extigy external audio subsystems for PCs or M-Audio's MBox pro-audio preamplifiers.
I hope this gave you some ideas. Good luck!
"I have always wished that my computer would be as easy to use as my telephone.
My wish has come true. I no longer know how to use my telephone."
— Bjarne Stroustrup (creator of C++)