I bought a pair of Theater series pi 7's with the Emminence (Deltas I think) then heard other horn systems at an audio get together. The Pi 7's with the Emminence drivers just didn't sound clean after hearing the other systems. Note that there were a LOT more bucks in the other systems than I had in the Pi 7's.I changed to what I did partly because the first horns I heard were Klipsch cornerhorns and the K15's were one of the speakers used in them. Part of this whole journey for me is "playing around". I enjoy myself as do a majority of other people in the DIY forums.
If I was just going for good sound with no playing around I'd just pick up one of Waynes kits including his crossovers with the JBL drivers and expect better sound than I currently have. I'd buy the wood locally though. This opinion is based completely on respect for Waynes knowledge related to audio.
Wipe that smile off your face Wayne ;-).
Grant.