First of all, I'm flattered that you'd take such stock in my opinions, but don't deny others from helping you out as well!

You can never know enough! It is extremely good of you to be familiar with more than one application, as as you say... people use more than one and it's better to not limit your career prospects.

Being familiar with Maya will make learning Max much easier, although you will get frustrated now and then because of what you perceive as limitations of Max. I'm sure anyone who learns Max first finds Maya just as frustrating.