For most users there is nothing wrong a top quality DI AR (BCM, Colt Defense, etc). There is a steep premium associated with an equal or superior quality piston AR. There is a very steep premium for gilded edge technology (read: FN Scar).

I'm blessed and fortunate enough to have acquired a few pinnacle level rifles (FN Scar-16, FN Scar-17, LWRC M6 Individual Carbine - Enhanced, etc) however, I would not feel poorly armed if all I had was a single BCM or Colt DI AR and a Glock 9mm.