I open similarly to how I did in WoL, DT expand. Although I've changed the build somewhat to accomodate cheaper DT's and mothership core.
I find blink builds that forgo detection are kinda bad, cos it is possible for the dt shrine on some maps to be put in a location you can't scout easily because of nexus cannon.
I think your mid game transition against a DT opener should be robo -> colossus, as if you go stargate after such a gas investment in the stalkers, a chargelot archon timing could just straight out kill you.
Against phoenix I'd put 3 stalkers in each mineral line, get a forge, get cannons up, and if he keeps investing in phoenix I'd consider a blink stalker archon bust off 2 base, or you can take a third and tech to storm to counter mass void.
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