(9) Pylon
(12) Gateway
(15) Assimilator
(16) Pylon
(17) Cybernetics Core
(21) Pylon
(22) Assimilator
(22) Warp Gate Research
(25) Gateway
(27) Stargate

- Build a handful of Zealots and Stalkers early on while you are working up to getting your Stargate, this is to defend against early pressure 
- Switch Gateways to Warp Gates once Warp Gate research finishes
- Save some energy to Chrono Boost your Void Rays once your Stargate is done building