Years ago I got a Yugo SKS and was impressed with it and cheap 7.62x39. Then I bought a WASR-10 four years ago and again was impressed - it's much more handy than the heavy Yugo. And now I also have an AR which really impresses me.
I think there's enough good info above to choose the one best for you. Really it's hard to go wrong, each is a fine rifle. I'm keeping all three myself.
Thanks for the pics of the Shernic Bull pup stock, GunzRgood! For $159 that looks like a fun project. I've got to give that more thought!