Nick, i have an EP600. I have also lived in 4 different locations since buying the 600. I have never had a problem with lack of output/fill, Also there have never been "bad" seats in any of the locations i have lived, I do plan on adding another 600. However, this is for a stereo setup, not due to lack of output.
If you check out the auction site, you might be able to pick up a pair of EP600's for your budget, or close to.
When the amp for my 600 gets back, next week. I can tell you how my current pair 8" JBL subs mix with the 600 if you want?
