There are lots of vintage 12", 10" and 8" wide band drivers that are still reasonable in price. Look for those with grooved paper cones and alnico motors. Speakers pulled from tube consoles or tube organs can be surprisingly good. Scroll down and read what Steve D. says about them and the F-15.
The F15 is still a driver I want to load in these baffles. I am sure I'll do some research and find a 12" driver that I can mount in them at some point. If you come across a 12" driver you think would be worthwhile let me know!