For fellow Protoss players, scout early with your probe and get fast gas for the Charge ability for your Zealots. While your waiting for it to upgrade you can also get Weapons 1, but what you should be doing while they are upgrading is rushing zealots and possible stalker as soon as possible.
My toss strat/BO for the first 5 minutes:
9 pylon
chrono two probes
11 or 12 gate
pylon + gas
fast cybernetics core + and chrono two zealots
next gate
next gas
chrono research warpgates
robo - observer is first thing out
warpgates - stalkers/sentries
Start looking to expand
observer takes a look around...
I have about 2 zealots guarding holding the ramp for early pool and every unit thereafter is a stalker until I get my obs up, then it's scout to react. Reaper rush fails to my first stalker out, zerg rush fails to 2 zealots guarding ramp, marines/marauders gets colossus and immortals. I avoid void rays, mostly proxy pylon and harass, but I'm not very good and my micro is bad. I've lost because I forgot to Hold Position with zealots, because I blocked a gang of three immortals with my own stalkers, etc., etc....
If you're not harassing with something you're doing it wrong. Warp prisms are expensive but load up two immos and send them behind their base. They're tough and will last. I'm starting to see a sneaky protoss harass with cloaked dark templars, make sure you block your ramp or keep an obs near your base (cannon not a bad idea, very powerful this time around)!