Which format is the most popular these days and which format has the best chance of surviving? Anyone know? (i.e. what should I look for when buying components?)

I have SACD, and love it. If I were buying a DVD player now though, I'd shoot for one that combines both DVD-A and SACD. I've never played a DVD-A disc, but some think that it's a bit more cumbersome than the SACD's.

Doug