Single Driver Horn vs Multi driver efficient spker

I have delved into SET and have gone for multi driver speakers to single driver full range. They are OK, but lacking dynamics and punch. I have been told that GOOD(expensive) horns would do the trick, but I wonder if I should go back to an efficient Multi driver speaker, i.e. Coincident Total Victory. I know that SET and lots of drivers and crossovers are not the best, but I not over whelmed with the Single driver thing. I would appreciate your thoughts.
Thanks
Mike