Currently (in Gold league) in PvT I've noticed the most common builds are the 1-1-1 marine tank banshee all-in, the 1 rax fast expand, and the 3-rax early pressure in to expand build.
The three-rax push is what I've had most problems with, (for a long while I thought it had gone out of fashion) and I've found it nigh impossible to not at least lose my expansion to this push, so I end up behind as he will be expanding as he pushes, and I'm stuck being behind for the remainder of the game.
Here's a replay of the most recent incident, where I held off the push just by forcefielding my ramp until he went home. I teched to colossus, got scanned, and saw an increasing number of vikings so decided to push before it got too high and got smashed, but I don't think that mattered all that much since I was already so far behind by then, from my perspective.
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