thought I'd chime in here as i am using the iQ system for my PA. I have a pair of 15's, a pair of 10's and a pair of the iQ15b subs. I havent used their 12's however. The iQ 15 would better your lm3, ny151 rig. I have a Mark Bass 121 rig with ny121 extension and the iQ15 will keep up with it. A single iQ10 will not, at least in bottom end. It does get very loud, just not real deep. Fine for small gigs.
I have, on occasion taken out my iQ10 and set it on top of a 15 sub as a rig. That rig will rattle your teeth and cover a fairly large room but it's a heavy rig at around a 100 lbs. All the Turbosound speakers are heavy because they use old school ferrite magnets which sound great but are not back friendly.
As far as connectivity goes, I love the convenience and versatility of the ethernet system. I'm using an x32 Compact and I like being able to control most of the parameters right from my board. That being said, however, I use my system almost exclusively in my studio and rarely take it out. I don't trust the cat 6 connections on a gig as Berhinger cheaped out and did not include ethercon connectors on these speakers, it's just a regular cat 5-6 socket. Somebody trips over one early in the chain and the whole system goes down. So when I do take these speakers out I use the xlr connectors anyway. I also think the analog connection sounds better, but that may be in my head.
The other problem to be aware of, is there is no corner protection on the cabs and if you don't buy covers there going to get pretty beat up.