Blown Speaker in AR Sub

I have the Acoustic Research ARS112PS subwoofer (250 watt amp) and the subwoofer is blown. I am trying to decide if that enclosure/amp is good enough to buy a new 12 and what kind should I buy? Or should I spend about $250 over what just the woofer will cost and buy an HSU STF 10?

The sub will be matched with Dynaudio 50 L/R/C and Dynaudio 42 RS/LS.

If you have any other suggestions I would appreciate it.