Dude, you really need to learn your way around a forum. First the doublepost, now you've created a whole new post as a supplement to your first, causing me to read this, then go back to find your first post, read that, and then try to put it all together. You should have edited the first post w/ this info, and posted it once in one place to start with. I'm not picking on you, I just hope you learn a little from this. I'm still glad to help.
Anyway, first of all, understand one thing first. I do not mean to offend anyone, but AudioBahhhhn is garbage. Orions are pretty good amps for the most part, but its a no brainer to stay away from the audioBahhhhn.
Wiring- It really depends, you probably have two viable options. You could run it either way, series/parallel @ 2ohms or Parallel/parallel @1ohm, the orion probably could handle it. I'd first try series/parallel and see if its enough power for you and the rest of your system.
This is why everyone should buy dual Voice coil subs. There offer you a great variety of wiring ability, safely AND without distortion. Good subs, good amps, hope the rest of the system keeps up. good luck.