I want to manipulate photos into silhouettes and other art forms for silk-screen designs. I'm looking for a recommendation as to what program to purchase.
This forum is used for discussions about Adobe Experience Design CC.
I'd usually recommend asking that question on a more general forum.
Of course, we recommend that you give the Creative Cloud suite a try, since you'll have access to the most powerful image editing software on the market: Photoshop allows you to edit images, Illustrator will allow you to do vector art while XD will allow you quickly and easily create prototypes for your Web and Mobile apps.