I have made many of the Cellar Craft Showcase line.
For full bodied, their best by far is Amarone ... but you must be prepared for a minimum of two years aging to really develop the flavour.
I also really like the Merlot. CC Showcase Merlot is preferred in our own private taste tests to the WE Stag's Leap Merlot. However, it is smooth and medium bodied as a good Merlot should be and you did seek a full bodied red.
CC Showcase Rosso Fortissimo and Barbera are both good full bodied reds but neither can match the power and profile of the Amarone in my opinion.
That said, I do not think you will go wrong with any of the CC Showcase reds with skins as long as you are patient with the aging.
Regards ... Doug