Supports! When do you buy Sightstone?

I am a Janna main. I was wondering, when do all you support mains out there buy a Sightstone? Do you buy it before gold item upgrade (Nomads/Frostfang etc), before boots? or much later? I am torn, If i rush wards I am much safer from getting ganked (since the yellow trinket just doesnt cut it) but then I find myself gold starved early (and the ADC whining I dont have ardent censor yet). Mostly, I upgrade gold item and boots on first back (about level 4-6) and then get Sightstone on the next back. I cant figuire out what is best. What do you guys think? Talking Sightstone wards btw, I buy Control wards everytime I go back if I can.
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