Alina, Have you made you visit to E-grad yet? Hope you found some things.
If you run across any Poberjesky / Poberezhsky, Tsibulvesky, Dashevsky, Verbitsky there (esp. the Poberjesky and Tsibulevsky) I'd be very interested. It'd be cool if you could take as many good photos of the Jewish cemetery as possible to post to JewishGen and flickr. Good luck!