I really agree with single strain discus being the most desirable to keep - and that makes the best first impression.
Even though this little experiment for me was simply (not greatly attractive) Red Snake Skins, and only 3" juvies at that, it convinced me that single strain species was the way to go with discus - whether domestic or wild. It just grew on me, and I haven't changed my mind.
But as has been mentioned, I think some type of Reds make the most dramatic show of beautiful discus of the same color/pattern !