how much cooldown reduction should i be going for?

As much as possible. I mean you should aim for cooldown reduction on your weapons, rings, amulet, gloves , helmet and possibly belt (the vigilante). The more you have the better.

This post was edited by Vare on Sep 6 2015 01:33am

60+
Use the cooldown rune on sss
flow of eternity in cube
Beacon of ytar passive

If NS in-geom is also nice
Lion claw on seasonal

This post was edited by CallMeMatt on Sep 6 2015 01:53am