CJ, I'm excited for you! Few things... Be methodical about the construction. Dry fit things first and then use the PL construction adhesive judiciously. I've heard of folks with small air leaks that have had major impact on performance.
I use the BFD 1124, which is the cheaper one and does not have a HPF. I've run mine beyond anything reasonable with the torture test movies, and have not have one sign of stress in 2 years. The BFD 26 something or other is the slightly more expensive model that has HPF. Many have liked the minidsp. The 1124 is about $30 used, so it's worth a shot in my opinion.
Be careful installing the drivers themselves. They are heavy and at an awkward angle. It's easy to have a screwdriver slip and go through the cone. Some have done that.
Construction by yourself should take about 3-4 hours and the only piece that might be stubborn is the final large piece. For my first one, I cursed for a half hour before it settled in place. For the second, it went right on.
My EP4000 did not like running bridged. If you're running one DTS, you should consider wiring one channel to each driver. I can't remember all the details, but the wiring is very easy to mix up. Ivan at Danley verfied that you really can't hurt anything. Try to get it right and if performance isn't there then you likely have a polarity issue.
Be prepared for lackluster performance without an EQ. You'll hear the potential, but it will be very mid base honky with no deep stuff.
Have fun! Look forward to some construction photos!