Umm, go with 16 gbs of ram, black ops 3 RECOMMENDS 8 gbs, so if you want good frames, go with 16 not 8, plus the i7 4790k is more powerful but not by much, so for a budget build, go with option A, but if you want performance, option B is better. I recommend 16 gbs of ram, gtx 980, with an i5 4690k for a good balance.