I've heard them, but preferred the sound of the wooden bodied QSCs -- the HPR122i speakers (now called the KW-122?) are what I ended up getting for mains for our band and I absolutely love them -- fantastic sound, and maybe the highest quality construction I've ever seen on speakers.
I will say that the K-10s and K-12s sound better (IMO) than most poly speakers like the Mackie and EONs, but I still prefer their wooden enclosure models. They are heavier though -- the HPR122i speakers I have weigh 60 lbs. a piece.
I think any of them would do fine though. Since you have the sub the slight extra bass in the K-12 isn't that big of a deal. The weight savings on the poly speakers is not insignificant and could well be worth the minor sacrifice in sound (IMO) in your situation.