Why such the hurry? No way would I say that CT is better than the alpha, but what do I know. Why keep wasting money on subs if you aren't even going to give them a proper enclosure?
You should spend the 150 on a good box. Build it for the sub you WANT to have, and then run the pioneer in the new box until you can get the sub that the box was built for. You are trying to do things backwards because a sub is only as good as the enclosure my friend.
BTW there are better subs than the CT that are cheaper, at their normal price than the CT is on sale! Quite worrying yourself to death over that sub, it's not even worth it.
Edit * grammar and stuffs