Most of it isn't pure SPL stuff. Sundown only offers amps (great amps at that though, very good prices). Same if for Incriminator, but a lil larger price tag. Digital Designs is more of an spl brand but has a full line to offer (I'm sure you've heard of the 9515). Stereo Intergirty subs are very SQ but have very good SPL. And Rainbow and CDT both have great speakers, as well carry a line.
I would say of the ones I listed, CDT or Rainbow, DD, Sound Splinter (I'm sure you have heard of the RL-P subs as well) and Sundown would be best. (I really just want a local place to buy Sundown lol).
The key would be to prove to people that these un heard of brands aren't garbage, as most automatically assume. If I ever get another job or sell these JLs I can show the Sundowns in action.