I would love to have that KF760/761 rig you're considering. My little company is using the KF730 and I'm very happy with them. Troy Gwin and Geri 'O cover very large events using the big EAW's with excellent results with the new EAW processor.
EAW's touring usage guide recommends (1) SB1000 per KF760 or (1) KF940 per (3) KF760's. Obviously, the horn-loaded KF940 sub has a great deal more output capability than the SB1000. Interestingly, the BH760 has the exact same output specs as the KF940, though the 940 has lower extension, is much larger, much heavier and thus completely impractical to move about IMO.
Each of these three subs present a nominal 4 ohm load at similar input power ratings. I'm sure none of this is news to you. The SB1000 is one of the most successful front-loaded subs and deserves to be. Nevertheless, you can use a lot fewer subs and amps if you go with a good horn-loaded design. The thing that becomes the issue at this point is sound quality. Most folks I know would rather have the SB1000 as long as they don't have to deal with the quantity and cost associated with how many you need and how many amps you'll need to power them. On that point alone I used to use the BH760 and made a lot of folks happy with them.
Then I found the Danley TH115. IMO, this sub sounds better, by far, than any other sub I've heard. They also have a little more output on a one-on-one basis than the BH760. I really think you'll be doing yourself an injustice if you don't demo a pair of them before making the plunge. The TH115 is the only loudspeaker I've ever had that consistently get compliments from people that know little or nothing about sound. Their accuracy is stunning IMO.
A second thing about the TH115 is that it presents a nominal 8 ohm load vs. the 4 ohm load of the EAW's, requiring a little less than half the amplification to achieve full output. I'm driving (6) TH115's to full output with a single QSC PL380, (3) on each channel in parallel input mode. The TH115 is also smaller and lighter than either EAW sub. I wouldn't have believed this before demoing them myself. The following link has some measurements and notes from that demo:
http://srforums.prosoundweb.com/index.php/m/142487/4332/#msg _142487
Note: Both Troy and Geri 'O are EAW dealers that I've purchased from and trust completely. I'm a Danley dealer.