One.<p>I know I am being snarky, but in my opinion all startups should aim for being self-funded with no outside investors. This is not because I think this is the way to get rich, but because it gives you the greatest freedom. Taking on investors should be your last resort, not first step. Making something great and living a good life is more important than money.
This is going to sound stupid but you should pick up as many as are useful to your specific needs. If you are super desperate for money, you might end up with a ton of angels. (Just remember the tradeoff that you will be managing a ton of personalities forever.)<p>On the flipside, if you can find a small handful of angels that not only bring money but who can help you with sales, marketing, or operational, then go for it.<p>Never forget the time commitment that you have to put in to every single person who gives you a dollar.