One warning:
The PC version of this game has some serious problems right out of the box. I ordered my Collector's edition from Amazon.com (still en-route) but my dad who didn't want a CE just got his from Gamestop and has been trying to get it to run behind me. The problem is Origin won't launch the game on windows 7 systems saying it's not compadible with 64 bit tech. He spent some time getting ahold of one of their customer service guys in a chat mode who told him that ME3 will not run under the current version of the Origin software, implying there was an update needed, the problem being that the most recent version of Origin availible is the same one he happens to be using.
I am not going to say ALL PC users will run into this problem, if you've gotten it running, good for you, but he has run into this problem and has a pretty good rig (and it's not a hardware issue, the CS Rep even said it's Origin). To save yourself some frustration if your still waiting to install it, you might give it a day or two despite the massive anticipation because it seems EA apparently has some things to iron out with Origin... which is absolutly insane with a release like this.
If you happen to have hit this wall, your not alone, and apparently they are working on resolving it whenever they get that "new version" of Origin out there.