I'm waiting to demo the ETX line myself, but haven't yet heard it so I can't speak their performance.
I can however tell you that I own a pair of EV ZXA5-90 boxes, and I am tickled pink with their performance. Don't stray away from EV simply because of anything you may have heard about the live-x and zlx offerings. Everyone needs to offer something entry level these days.
With just my pair of mid-high's and four 2x18" bass bins, we filled a 172 person theatre with hard rock levels and had ample headroom to spare. I'll bet with 60-deg boxes two per side you could get to the 400-person (i know i'm doing it again) level. Since buying them I've been looking for a powered sub that could keep up, and the ETX18sp seems to be one of the few that could contend on paper. However, for other reasons I'm saving for TH118's.
+1 to the QRX series. Other than the 115/75 that caught fire as a monitor for my lead guitar/keyboard player, (long story, he was always too loud) i've seen those cabinets really hold their own. Lots of people around here seem to be running the QRX212/75 cabs with great success for applications similar to yours. If you can find some JBL SRX series stuff in good shape, those are another favourite around here. The horns are a little too "rock" for my taste, but for some that's what fits the bill, and they sure do rock!
