3-way with 15" LF + 5 or 4" Mid + 1" Tweeter

Hello Everyone!
I'm looking to build a 3-way with 15" LF + 5 or 4" Mid + 1" Tweeter. For the LF, i have decided to pick between Beyma 15P80Fe/N (or) Beyma SM 115/N (or) FaitalPRO 15PR400. I would like to pick one of them and will design a separate vented enclosure for the LF.
And planning to cross at 400Hz, which one do you think would be better for the LF duty. I will drive them with 20wpc amp, so sensitivity and impedance figures does matter and so the PA drivers. As all of them are reasonably sensitive, my choice would be for the one with most linear response till 500hz.