There's not a correct answer to your question, it all depends on the "Studio" that you aspire to and the type of work you want to do. For me (in printing/advertising shop) its: Illustrator, Photoshop, QuarkExpress, Painter, Streamline, Carrara, Bryce, CorelDraw (what can I say, some clients just won't cooperate). Illustrator & Streamline are great for prep work in conjunction with C and painter/PSD are essential for postwork & prepress prep work. I never have any need for animated, web or game stuff so have no practicle info on that aspect of Carrara. So far C is pretty much all I need for the ocassional 3D project that needs to be done.