I say keep the subs you have...I really regret getting rid of mine //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif
I know you won't listen to me though, so go for SA-12 if you want the best bang-for-buck, or go old-school if you want something original. I have nothing against the SA series of subs except for the fact that everyone and their brother has one! I don't find joy in owning equipment that thousands of other people own. In fact, my entire system (the aftermarket parts) is composed of equipment that you probably have never heard of.
Goddamnit, I'm like a car audio hipster, and I HATE hipsters...