Replying to Tax return money came in!

Decided i'd put a chunk of it into my camera gear pool.

What should i pick up that would benefit me or be the best to get. Im not sure what to get.

Current setup.

Canon T2i

Tokina 11-16 2.8

Canon 50mm 1.8

Canon 70-200 4.0

Rode Videomic w/ Deadcat

Battery Grip

Video Light

Giottos mtl3361b Tripod legs

Weifeng WF-717AH Fluid Head.

SO what should i add to my setup. My budget im thinking is about 500. I can go a little more though.

Thanks guys. +K for all help and suggestions.