Ask HN: Where to find angel investor who would invest $50,000?

We are 2 guys from Europe working on a software project and we are trying to find financing, because our own cash is coming to an end. I looked through some possible options and angel investors seemed like the most appropriate one. If you think otherwise, please let me know.

We are willing to give away 10-30% of the company for the financing and any other help the investor could provide. We have a working alpha stage software which is near it's first beta release. There are approx. 4-6 months of work until we are ready for a full launch.

Where should we start? Is it possible to find business angels who would invest into a company from another country? Is this an adequate amount to ask for?