Welcome back. Zilch liked the Deluxe best, but he also went bigger. I have a few econowaves including a pair that is OLA based. I built others like LE14H-1/2342/2417, 4Pi, and am now building a second set of 4430s. Not econo, but I have a point. Your improvements will be relatively small and the cost will be greater to get those improvements. Personal opinion here...of all the varieties I have built, I have found the most listening satisfaction from a big LF driver with a good CD and horn. In your case a 12, 14 or 15 inch might be worth investigating. All in all, the journey is as much fun as the destination.