It definitely doesn't have to be from one person!  We'd like to see many investors/financiers on the books with us, to keep us accountable and to help spread the word about our project and generate interest.  The more connections, the better. 

As far as individual loans go, we'd like to stay above 1 or 2 Bitcoins just to make book keeping easier. If you'd like to talk directly about it, feel free to PM me.