Overall solid build imho. I am not able to comment on the wireless adapter and other "small little extras", but the main parts are arguably upper-tier choices for a single GPU upper-middle range gaming build.
Regarding your GTX 660 Ti, I would first ask what games you play and at what resolution and settings. That information (along with your budget of course) will help you best determine the GPU you need/want. In case you are not familiar with it, here is a good bench of the GTX 660 Ti:http://www.anandtech.com/bench/Product/647