I'm planning on building a new computer I can use for gaming as well.
I'll go for that setup:
Gigabyte b250m-d2v mainboard
Intel i7 7700 3,6ghz
8gb ddr4 ram
600w Xilence PSU
500gb ssd & 500gb Hdd & 1tb hdd
Nvidia GeForce gtx 1050 ti
I might switch Mainboard around for one that supports overclocking and get an Intel i7 7700k 4,2ghz, but that depends on the budget.
I know how CPU heavy gw2 is, I think I'm okaishly covered on that side (correct me if I'm wrong!!!)
But will a GeForce gtx 1050ti be enough?