Yeah, the 1gate goon is what most people do against Terran. I like to open up with a 2gate now or then, just to throw my opponent off guard. From there, I either tech to Templar Archives or Observatory first. Dark Templars can work wonders in causing confusion for a Terran player because he or she only has only one or two ComSat scanners and the psychological damage is amazing. Templars easily eat up Siege Tanks because of the Siege Tank's low mobility. However, if you go this route you would be eschewing observers, which help a lot in scouting and destroying mines. It all depends on who you are playing and how you are playing.
Don't forget about the B.Net scrubs that try to MnM you in PvT. It works surprisingly well early game and can easily push you out for a win.