Any advice on buying quality vinyl

Uberwaltz, I reached the same conclusion doing a test of three recordings of Madman Across The Water.  I played Tiny Dancer from all three records and the one that sounded the best , save for pops and clicks was my original Uni pressing from way back.  How are you able to determine what is an original pressing?

Thanks for all the great replies.  Lots to consider.  Question for @inna, I have an Okki Nokki, where do you get your Audio Intelligent fluids, pre-cleaner plus three step solutions?  
Maybe this is a question for a new thread, but do you prefer older earlier pressings with the pops and clicks or the newer audiophile releases.  Case in point, as with my early discussion of Elton John recordings, today I was confronted with the choice of an Elektra version of Queen's A Night At The Opera or a new audiophile recording.  I chose the older recording and have been happy save for a few clicks and pops.