The tavor 21 or x95 is an well built quality 556 if you don’t mind bullpup. a cheep 556 and again bullpup is Norinco t97 that shoots fine. Some have QC problem like I do, some mags won’t click in, it dents the crap out of the brass so reloads are out, and it’s fun to hear the guy three lanes over complain about the eject brass launching into orbit. Ok don’t get t97 it’s got issues. Finally the Wk180-c is my favourite 556, it feels good in the hand, it’s balanced unexpectedly lite and it’s bare bones design that is favoured by many who don’t like a cluttered gun design. if your like me and was trained using a C7 for the last 26 years it’s AR 15ish {m16) lets you react from muscle memory doing the TOETs and IAs. As much as I like the compactness of the tavor I keep slipping back into training and forgetting the magazine is behind
I'm thinking of adding another upper only... just to switch my DD upper on that one 
