I have used GoBigNetwork.com and thats from where i got a couple of investors for one of my sites a few months back. Though that site has been sold off for now, but i remember initially, it was like bad experience. May be i wasn't phrasing it properly, may be i didn't use subject that would invoke interest.

I tried again with better subject and rephrased content and i got response.

Since there are plenty of people like you, like me trying to attract funders, so it is more of how you phrase your subject title to invoke interest in them and encourage them to read and reply.