Going back to the SA cabs, I bought the 210 they offer for $189 new. The ratings are 400 watts at 8 ohms and I use a Genz-Benz Neo Pak 3.5 to drive it (350 watts at 8 ohms). I use it for small gigs where there's a vocalist/acoustic guitarist through a PA (also Seismic Audio brand), and a small drum kit (3 piece). The SA cab has enough volume to drown out even a loud crowd and the rest of the guys, but I'm a nice bassist and don't. It fits perfectly for practice and small gigs. For bigger gigs I pull out the ampeg setup, but this puppy is reliable.
I had a short chat with Dave in their support department, who informed me that their drivers are made for them by them. It may be Chinese materials, but they're assembled in Memphis, TN.