Our defensive scheme (again)

Ok. I think I'm *finally* starting to get our defensive scheme. I've always understood offensive schemes better than defense, and the fact that our defensive scheme is unusual at that, I've been a little slow catching on. I think, due to some of Brian's posts (the recruiting post today actually helped solidify things in my mind) I'm starting to get it. Here's the run-down as I see it... Correct me if I'm wrong w/ any of this. We have: DE Nose Tackle (someone big) Defensive tackle (3-tech... alittle smaller) Quick DE (AKA deathbacker, aka Craig Roh) 2 inside LBs OLB ("spinner".... what Furman will likely play) Box Safety (I think this is actually our Free Safety, which is odd) Deep Safety 2 CBs. From what it seems, this offers us flexibility. On run plays, 8 men in the box.... DL, the 3 LBs, plus box safety. On pass plays, this offers us flexibility to blitz, *or*, the box safety and "spinner" are also capable of pass coverage, since, one is a safety and the spinner will tend to have more safety-esque athletic ability. I know that's a pretty simplistic sketch of things, but, am I basically correct? Is there a name for this scheme we run? (I've heard 4-3 under kicked around) Anywhere I can read up on it?