in most cases, that i7 isn't worth the extra cash for small performance gain. for a mainly gaming PC, an i5 is the most you wanna go for.
may as well save a bit with the RAM going with a DDR4-2400. in most cases, the performance difference isn't all that big compared to the DDR4-3000
mobos don't really contribute much to gaming performance, so I went with something a little bit cheaper.
consider skipping the DVD drive, and wifi adapter. the former, you're not likely to use a lot unless you do have specific reasons to use it (you can install the OS with a USB thumb drive if you got any), the latter, you gain better connectivity sticking with ethernet (that is, if that's possible for you). you may also want to consider buying W10, and...