Whoa 2 for 2 on beating Protoss on the ladder this morning. I snagged a new build from theOgnis that I'm digging in the matchup. It isn't anything new or revolutionary but it does set you up on 3 CC pretty safely.
12/12 Reaper -> Reactor
CC @ 400 at natural
Factory @ 150 minerals -> Mines (you'll make like 3-4 defensively)
Engi @ 150 minerals (mainly to spend some gas)
CC @ 400 @ depends on the map and his build order
2x Rax @ 300 -> Tech/Tech -> Stim
Port
2x Gas
Depending on if you need the mines or not (like if he went with a Nexus/Collossus you can be fairly sure you won't need more) reactor factory to swap. If not just reactor the port.
CB shields
12/12 Reaper -> Reactor
CC @ 400 at natural
Factory @ 150 minerals -> Mines (you'll make like 3-4 defensively)
Engi @ 150 minerals (mainly to spend some gas)
CC @ 400 @ depends on the map and his build order
2x Rax @ 300 -> Tech/Tech -> Stim
Port
2x Gas
Depending on if you need the mines or not (like if he went with a Nexus/Collossus you can be fairly sure you won't need more) reactor factory to swap. If not just reactor the port.
CB shields