Saving some money: SInce this is an intel build. You can go with any 2666MHz ram . It wont hurt FPS at all. Go with any one (corsair,patriot,gskill any which you find cheap).
If you are going to upgrade to ryzen anytime in future then patriot or gskill flare series. they can easily oc to 3200 even if rated at 3000MHz. Look fo samsung B dies as they can oc with lower CAS latency. which will help reduce latency