User blog comment:Andrew.heo1/When to Get a 3rd GP10 Item on a Support?/@comment-3514681-20120815150217

I would recommend you to grab all 3 asap, as to compensate to low assist/farm potential of early game. You want to get as much return from them gp5 before you transform them into something more serious.

But do not forget the boots. As the rule of the thumb goes, grab boots 1 right after the 1st gp5, and upgrade them after the second or in the middle of the third gp5.