Photoshop and Deep Paint are not the same type of software. Photoshop is an overall image manipulation program for photos, web graphics, and what have you. Deep Paint is a painting program that uses real-media feel. I tried the demo, but Deep Paint seemed just like Painter, which I already had. Deep Paint 3D on the other hand allows you to paint directly ON a 3D model, which is quite a different thing altogether. I would say that a good option would be to get Photoshop and then get Deep Paint as a plugin later. Then you get real media painting inside of Photoshop using a non-confusing interface (Painter is definitely a learning hurdle).