The fastest way would be:
1) Ask on Clarity! :)
3) Contact the incubators and ask if they have a list they'd be willing to share.
4) Email entrepreneurs who recently raised and ask them for 2 names each.
5) Contact Series A/B investors and ask them who they've co-invested with in seed investments.
Hope that helps.
Your best bet is to talk to people in your network. Tell people you know what you are looking for and ask if they know anyone that may be interested in investing. Not all angel investors refer to themselves as Angel Investors. The other place to find angel networks online is http://www.angelcapitalassociation.org/