Scott,
I've been reading this thread with great interest. Personally, I don't believe the JBL's by themselves will support larger venues, however, when combined with a high quality sub, they should be more than adequate. You may also wish to consider using a pair of Barbetta Sona's, which would accomplish the same task, plus provide you with mixers and EQ's on each of the powered speakers.
Finally, I think you should hop in the car in January and join us in Bossier City. That way you'll have the opportunity to hear them all and meet with some of the folks you've communicated with over the years.
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)