While I don't own the K series, I have a friend that does and I evaluated them extensively before my recent purchase. I went with the JBL PRX612m because of name recognition (I also do live sound) and overall balance, but when I did the eval, the top 3 boxes were the K12, the EV112 and the JBL PRX. There are some notes in another thread, but my take was the EV was best for recorded music due to an inherent High/Low emphasis (DJ scoop), the K12 best for live (especially acoustic) due to a mid emphasis, and the JBL was the more neutral speaker (all speakers set flat). All were good and as Jon said, the EV is probably the best value, though the paint finish is not as good as the others.
One friend in a band chose the K10 due to the wider dispersion than the K12, as they don't perform in large spaces normally, so reach wasn't needed, but width was. They have the KSub which, IMO, is severely lacking. They use only one, and it helps, but nowhere near what the KW 181 does (or any of the other single 18s).
You didn't specify your use needs (applications/situations as you said), so it will be tough to give much more advice.