I've just started the process of building 2 ported subs for nearfield in my basement theater.
I ordered 2 of the diysoundgroup ported 15" kits. Kit information can be found here: http://www.diysoundgroup.com/ported-subwoofers-1/15-cube.html
I am using 2 of the Parts Express buyout Legacy EF drivers, initially pointed out by Fuzzy Dog in another thread:
The Parts Express drivers are still available, can be found here: http://www.parts-express.com/15-famous-maker-dvc-high-excursion-aluminum-cone-subwoofer-4-ohms-per-coil--299-700