Donkeys don't kick you in the teeth (they don't normally kick that high!). But governments sure do. (Don't mind me - I have two donkeys and I love defending them.)

The rules for immigration are changing everywhere. But like Synthia said, it's best to check with your local US Consulate for details. My understanding is that the investment level for the E-2 visa depends upon the exact nature of your investment, so you might be able to get away with less than $1 million.
Cheers,
Bev