I've made pong, and I am currently working on a top down hack and slash in XNA using sprites.

I am a junior/senior studying computer science if that helps gauge a skill level or overall understanding of processes.

From here should I go into Unity, or should I try to do 3D in XNA, or move into C++ and DirectX (that is the final goal)

I'd like any pros and cons of each decision and what you recommend. I still have. Year or so before
I hit an employment market so I can continue to develop my skills an not "skip" any steps.