for the cooldown reduction and you get more gold per sec than since you can't poke that well with your 300 AA range and your long cooldowns. is not too good since you're a ranged champion. since you should be going in and out of the fight or skirmish you don't need the tankier stats of or .
is good because it gives MR and tenacity in case you get CC after engaging before you can dash out.
is important because it give you a fair amout of HP to soak up some damage but also a decent amount of AP for your heals, shields and ult damage.
is just a great item
You should always get or or to give your adc some nice stats and to boost your shields and heals wich goes a long way with WINSPEAKER'S BLESSING.
Going tanky is an option but I think you impact the game less.
or is to consider if you find yourself in a matchup that has a good disangage to be able to chase them