Check out
www.diytower.com as well, I added a pro-audio section with some good links.
Brands you want to look at:
Selenium
Eminence
Image Dynamics
AudioBahn
PartsExpress.com has awesome technical support that is a very valuable resource and they never have pushed at all to sell product. Highly recommended company.
All above have HLCD's The key with pro audio is getting the crossover designed right. It's a black magic to those of us that dont know are care about the details but find a hard core audiophile expert, explain to them what you expect the speakers to do and with little tweaking they can make what you need with a few bucks worth of parts and a solder gun.
Also, with only two 6-1/2" mid bass (if that's the fishnoyz.com enclosure) you probably only need one HLCD. Even with four 8" mid bass & two HLCD's on what were brewing up we have used the crossover to tone down the horns insane efficiency.
Remember HLCD's were likely designed to be used with a 12" or 15" woofer and a much larger horn lens than we can us in our application.
Post pics and congrats on the Enzo, sweet ride. I've got to mee a lot of the Centurion people over the years and they do a great job.