Which to choose will depend on yourself cos you are the one using it. So it has to be comfortable in your hands. As I have big hands, I would not consider the EP1. Besides the EP1 does not have a mirror in the body so strictly speaking it's not a DSLR. Also a friend of mine posed a question to me which sets me thinking. He asked me 'imagine mounting a longer zoom lens on the EP1, will it be able to balance?'
As for the D3000, I do not have much comments on that cam, but I believe the AF on the Sony cams are the best so far. It would be better for you to try the cams out.