if I were you, I'd not focus on SACD so much. you're probably right that the future of high-end audio will be computer (hard-drive) based systems, but you'll still need a good system to play it back (including a box that can play files that are higher-rez than CD/redbook). you might want to start by researching the 'squeezebox', which has a huge following.
as far as burning goes, those who choose to burn hi-rez files (as opposed to leaving it on hard drive) use DVDs.
as far as burning goes, those who choose to burn hi-rez files (as opposed to leaving it on hard drive) use DVDs.