Well, we did try to sell you on a pair of PB3000... so the value decision is something you have to determine for yourself. Sorry, Mate.
That said, I would not buy Sealed unless I was in a smaller room and could afford 3 of whichever I chose.
The cabin gain in a 3000cu'ft room with 3-4 good 15" Sealed Subs like the Hsu ULS-15 would be pretty flippin' fantastic.
But even then, If I could get 2 or 3 really well designed Ported Subs and a pair of very capable Mains... I'd still probably go that route.