Don't early exercise. Here's why. Yes, there are potential tax advantages; you avoid having to deal with AMT, which is significant. But the tradeoff is that you've thrown away the essential advantage that an option gives you: the ability to travel back in time and purchase stock with perfect knowledge of what it will do in the future. Why on earth would you give that up? An option lets you wait years with zero risk a…
Though if you're an early enough employee to be getting a strike price that you can exercise without any worry (on the order of $x00) then you probably should be getting stock directly vs options anyway.