I DON'T want to run 4 15s. It will take up far too much room. Originally I was going to go with either the 2 15" Revos or 4 12" Epics in sealed enclosures. I just want daily ground pounding bass that will shine on lows and still have good SQ. If I were to port either they would have roughly 8 cubes after sub and port displacement and the box would be tuned to ~30hz. The point is that I was something killer loud, but still sounds great. I doubt I'll be running it full blast all that often.
I also thought about the new Mag, as much as I hate their looks. I know they went back to the XBL^2 technology, but it just doesn't appeal to me like the others. Anyone got a link to some testing done with it?
I appreciate all the input thus far. Keep the ideas coming (I'm looking for more answers like bigbangtheory's). Just tell me what you think and let me know if there's anything else you need to know about what I'm trying to achieve.