I disagree with 1 and 2 if you want to get big. Like most people on this board in 2000-2002 found out, larger cycles are the way to go your first time out. It's your best chance to grow and you don't get a second chance at a first cycle. The biggest problem I see is not that people use too much it's that they use too little and then have to do another cycle with higher doses soon afterwards to get close to their goals. Also staying on 20 weeks is no more dangerous than staying on 10 weeks. It's just ineffective because the gains slow so dramatically in weeks 9-10. There is little evidence that #1 or #2 is true at all, that's myth.
That said, the board has changed, as I've posted many times. People here are no longer looking for mass and size but rather just to look good at the beach, or even more common, a fat loss plan. So maybe there is some validity in #1 for that reason. But if you're looking to be a body builder and not "I wanna look like Brad Pitt and get laid more", then larger doses are very important your first time out.
Larger = 1000mg+/wk