Your build seems pretty solid, some advise is however dependant on what you plan to do with it. Looking at your monitor and the GPU I'd say the GPU will be a bottleneck with heavier types of games and semi/pro photo and video editing. The processor is however top of the line and could be downgraded to an i5-6600K if you plan on mainlydoing games with it. For photo and video editing a powerfull processor is nice to have so in that case stick with the i7. If you plan on playing TripleA games then I'd advise to upgrade the GPU to a 4GB GTX 970 or R9 380 at the least. You'll be better off upgrading the PSU to a 700Watt version instead of 600Watt version.
The speakers have already been pointed out, if you don't value sound quality that much and simply want speakers for some audio then they'll do just fine.
One thing I'd lose most definately is the WiFi adapter 150N. It is half speed so sluggish at best and might give issues when you're further away from the WiFi source. For slightly more you'll at least have a 300Mbit N-WiFi USB adapter (and 600Mbit AC-WiFi); http://www.komplett.ie/tp-link-archer-t2u-ac600-usb2-0/80035878/details.aspx
Network cable is king, so if you have a cable available then please use that instead.
If you have a specific use for the PC I can have a look to see what else I can tell you.