Something to think about though is that if you would take an item with only 40 AP just for the sake of Point Runner, then you should consider taking a full tank item for Point Runner and combine it with a high AP item to make up for the overall AP difference from building a tank item.
These two sets are pretty equivalent.
+
= 5,900g = 115 AP, 60 MR, 75 Armor, +10% CDR
+
+
= 5,900g = 120 AP, 55 MR, 70 Armor, +10% MS
So between these two combinations, there's only a 5 AP, 5 MR, 5 Armor difference, so it's mainly just a choice of which active/passives you want and +10% CDR vs +10% MS. In either case, you could also hold onto the
component until full build if Point Runner is the part you value most and don't care about the Ohmwrecker or Zz'rot actives. The cloth armor in set 2 can go towards a Zhonyas or Ninja Tabis but in reality you could exchange it for 300g spent on anything else and I just listed a cloth armor to make the final stats of the sets more similar since set 2 is 300g cheaper otherwise.