1 base ^_^
Unless you're Artosis, in which case wall your natural off with 6 cannons and mass Archons.
But seriously, it's all about timing with PvP. Getting more units quicker till you can make a very strong push. It's kinda lame and will rarely go to a macro game but if it does just catch your opponents force off guard or build some annoying units like DTs.
I know I keep telling you I will teach you some shit but I never get around to it :P. So the next time we're both on chat me and demand that I show you builds!