The 893 is intriguing. For my next speaker build I want a "hifi" horn/waveguide, a smaller footprint (based on the standards around here), and full range is preferable, height is a non issue, however width is. Sensitivity isn't the most important thing on my list, an honest 93 dB is far better than most. I love the idea of the titan's and Maximus, but cannot fit them, the 1099's would be pushing the footprint, and the 8" stuff is about ideal to me.
I have the itch to build something and an even bigger itch to try out a horn. I can legitimately see myself pulling the trigger on a sound quality focused horn in the next 6 months or so.