Rod of Ages vs Hextech GLP-800
Rod of Ages is 300 gold cheaper, and grants 200 more Health + 20 more AP than GLP-800 at max stacks. Its AP becomes equal to GLP's after 5 minutes have elapsed.
RoA also grants the same amount of Mana as GLP when fully stacked.
Is it just me, or does RoA seem to have the short end of the stick here? You wait 10 minutes for an item that's only slightly better stat-wise than GLP-800 and has no active.

Gold Value
80 ability power = 1740 Gold
300 health = 800 Gold
400 mana = 560 Gold
Total Gold Value = 3100 Gold