There is no minimum investment, but realistically anything less than 0.1 Ether wouldn't be worth the transaction fee for the gas I would think.

Although there is no minimum it is important to note that in order to become a part of the "Private Angel Token Investment Community", which is where we will openly share and discuss our altcoin investment research, and Angel Token holders get to have their say and vote on the investments we make, you need to own a minimum of 10,000 Angel Tokens.

The same holds true in order to take part in dividend payments that are made in Ether each succesful quarter, you need to own a minimum of 10,000 Angel Tokens.

The price of Angel Tokens are 1 Ether per 1265 tokens, so normally you would need to invest 7.9 Ether to become a member of the "Private Investment Community" and the quarterly dividend payments.

However, due to the incredible bonus structure incorporated in this ICO you COULD actually acquire 10,000 Angel Tokens for as little as 1 Ether, but you will probably need to invest immediately after the ICO launch on November 27th at 12:00 GMT, because we expect that the tokens will be sold quickly in the beginning as everyone wants to catch the best bonus.

For each 1 million tokens sold the bonus drops...but you COULD get 10,000 Angel Tokens for as little as 1 Ether, (and get 8735 bonus tokens!), if you are early enough, and some investors will grab those big bonuses!