You may contact Dr. Bilal Philps. He gives lectures in English and renowned scholar. He is based in Doha and speaks in Fanar Mosque. http://www.bilalphilips.com/

You can get contact details of Fanar Mosque there.

Additionally you may refer to Hamza Yusuf's(American scholar) lectures generally availale in youtube.

Zakir Naik is definitely good. Would suggest to hear The Concept of God in various religion.

May God bless you to the right path.