Probably already said but here is what I use which has helped me in Gold:
PvP - 3 Stalker rush into DT harass with expand - If you do enough damage with DTs it can put you pretty far ahead and you can easily transition into Blinkstalker or Chargelot/Archons into the mid game. So long as you can hold the inevitable retaliation all in, you win.
PvT - 1 gate expand into colossus tech is pretty solid. Just need to be prepared for widow mine drops, hence why teching up to robo early is a good tactic.
PvZ - FFE into Stargate/Robo does well for preventing mutas if you choose to harass with phoenix and forces hydra which you are already countering for. Weak to a roach all-in so be preapred if you spot a late third.
Though somewhat risky I've still found them relatively safe and with getting a MSC fairly early (usually using the first 100 gas after your first stalker and warpgate tech - except for the 3 stalker rush) you have a fairly solid defence in place.
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