Hey all, just throwing in my two cents,
As a Kayle main, in the current meta I've found shockingly that I do not like to rush
or
, with towers being so strong and objectives being so very important I've found (to my utter disbelief) that running 15% cdr, 20% as with runes and 5% from masteries in cunning, with a
rush works amazingly well on Kayle Reason being Kayle naturally pushes ANYWAYS, this item provides EXTRA push, free farm and most importantly, in a meta where early monsters dominate (hello Ekko) durability.
The reason being is with objectives so very vital it gives your team some huge pressure versus split pushers, as well as allowing you to roam for objectives without fear of your tower falling.
Also provides durability versus tower dives early and protection from early ganks which is one of her main weaknesses.
Topping this off
in an average game lasting 35 minutes my
will literally pay for itself in farm having collected between 50-120 cs just for having it up while you are roaming and collecting objectives.
Usually my build will look like this (built in this order),
replacing the slot that I used to fill with
(which I would build next to last).
or
,
,
,
,
,
, 
The boots are subjective to the enemy team, should they have lots of cc, mercs, lots of aa, tabi ect ect.
Some times I will run with
but usually since I use only E to push to their tower and harass as the other skills are needed only if they retaliate I just opt for either
or 
I especially love this build versus Assassians or roamers (such as Kat or Twisted Fate) it allows you to REALLY punish them for leaving your lane by taking down the enemy turret within 2-3 waves mid game which allows you to roam while your tower is covered by the zzrots.
Don't get me wrong, this build will not get you 10/0 by 15 minutes, its strength is farming and pushing: it is selectively objective focused.
That being said Kayle has naturally high base stats on her E and Q, so the kill potential IS there during say a jungler gank and you are still more than able to punish enemies mistakes but your main goal is to simply take down their tower and then the next, and the next while maintaining your own life. you simply want to destroy objectives and win the game.
A Plat-Diamond exclusively Kayle player :) gl buddies!