Troy - After putting a single EP-350 V4 and a single EP-800 through the paces in a 25x24x9 foot room, here are my 2 cent's worth:
In your room, a single EP-500 will give you infrasonic shudders unlike anything you have experienced. It won't jump out at you, but rather will make you smile when you feel ripples of bass.
Work Debbie over on trading an EP-350 on a 500 ... and when you can afford it, trade the other in on a second 500.
You will have 15 Hz bass in your room that will never audibly distort.
We also have a Hsu VTF-3 Mark V, a Rythmik 15P, and an SVS PC-2000 here.
The sealed Axiom may not "win" at Data Bass, but for sound quality and slam, it's just fantastic.