For vinyl, it really all depends on what the source is. Personally, I see little point in getting a vinyl record of an album that was done all digitally. Now, something like Falling Into Infinity would garner some interest, seeing as it was done all with analogue tapes. In any case, vinyl still has its limitations, (I can deal with a few clicks and pops here and there, but it's the end-of-side distortion that gets me), and I prefer the CD pressing of an album 95% of the time. I do own a turntable, though, and enjoy listening to my records a lot.
As an aside, I should mention that before Rush released the remix/remaster of Vapor Trails, I was listening to a vinyl rip of it, and it did sound way better than the CD. I reckon it had to have been sourced from the same masters as the CD, though the CD suffered from so much clipping, and sometimes brightness, that it was pretty much unlistenable. The vinyl rip alleviated these harsh-sounding chopped-off peaks, and did sound a little bit warmer. It was certainly preferable to the CD version.