Thing is, I need a gp5 item to start me off (NEED). I don't want to buy something like
or
ON TOP of a ruby sightstone because then I'm super squishy mid game. That's why I like upgrading my gp5 item into something that fuses with regular sightstone so I can get the wards I need and the gold generating item I want, all in one slot.
From there, it's either more health or something with defenses to it. Anything extra like CDR or mana isn't mandatory, since I'm building to survive and provide an initial instance of utility once we encounter enemies. It's not like I'll be spending mana to wave clear, so I'm not bothered about buffing that particular resource on most supports I play.
I've gambled sometimes by skipping a gp5 item and instead rushing something like randuins or righteous glory on tank supports. They can get away with purchases like these since you mainly want to initiate fights and tank [towers], so not only will you make your money back via assists and objectives, but you're also not scared of enemies going MIA since you're forcing them to appear at towers and epic monsters.