Here, this website should satisfy your curiosity concerning the Riley SuperSkyRocket:
http://www.superskyrocket.com/
Not only do they have a few for sale, you'll also find several on The Controller website:
http://www.aircraft.com/default.asp?guid=uly33pzy
Suggest you sell your Beech first... I don't know of ANY 337 owner who would take one in trade.
Good luck.
SkyKing