A.R.M.I.A (Army) from Ukraine is a four member female group that has a number of songs under their belt, and even if their "I Love You" is a little "conventional" for them, it is still a stylish video.
2NE1 is for one of the girl groups who best can do attitude with real credibility. Sure, its in a relative kpop sense of toughness, but even in ballads an such they have a certain way of carrying themselves which earns respect for me.