Best Sub with Dynaudio 1.3MKII's

Hey folk, any suggestions for the best sub to go with a pair of Dynaudio 1.3MKII's? I'm using a Plinius 8200MKII integrated amp and a Rega Jupiter CDP. Your thoughts would be much appreciated.
You neen something fast. I was using a Monitor Audio ASW-210. Not a deep low home theater sub.,but it sounded great with the Dyn's. Saturdayaudio sells them.

REL Storm 3
Any good Rel Sub. Try the Stadium II. You will not be disappointed.
What's wrong with the Contour Sub.?