I have the MFSL and it does sound good. There are early Japanese Dark Side CDs that are rated even better than MFSL.
The 40th Anniversary vinyl release of Dark Side gets very good reviews although there is some sibilance. (I don't own this.) Besides the slight sibilance, it's supposed to be super.
I like the SACD surround a lot, but the best, smoothest sound is the DVD-A Quad mix.
Almost all the Floyd vinyl is gonna be good. For the best, I would recommend the original UK releases in mint shape. I hope u gots lots o' cash. An original UK Dark Side mint just sold for $325 USD.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=190224206167&ssPageName=STRK:MEWA:IT&ih=009