The Conti's DWS tires are all seasons, which would be important if you plan on driving in the winter. I think the Pilot Super Sports are summer tires. Both the Pilot Super Sports and current run-flats will handle better (in the dry) than the DWS.
I got this (and the Conti DWS all season non-rft)
http://www.tirerack.com/accessories/detail.jsp?ID=38
and it fits nicely in the trunk under the mat.