Your next upgrade would be upgrading the i3 3220 to either the i5 3570k or an i7 3770k. For gaming, the i5 would be best. For rendering and video editing, the i7 would be best.
And I'm quite certain your build will go smoothly. All those parts are decent quality. If you want a tutorial to help guide you in the building process, take a look at this...http://www.youtube.com/watch?v=W4Js2A1qdB8