Hi FOAL, it depends on what kind of lectures you are interested in.
Zahir Mahmood speaks about Islamic history and the Companions of the Prophet.
Bilal Philips speaks about general things, belief in Allah, Islamic perspectives on legal rulings, etc
Hassan Ali speaks about jinns and the unseen, as well as giving advice and general lectures on many topics.
Khalid Yasin, Ahmed Deedat, Zakir Naik do comparative religion, so their lectures usually involve some of that 'bashing' which you mentioned.
If you are interested in something specific let us know and we can point you in the right direction. In the mean time here are the names of some other scholars:
Muhammad Al Arifi
Muhammad Hassan
Muhammad Hussain Yacoub (I love his commentary of Ibn Qayyim's Med'arij As Salikin)
Mahmoud Al Masri
And for written works, search up Ibn Qayyim, Ibn Taymiyah, Imam Abu Hanifa, Imam Shafi, Imam Malik, Imam Hanbali, Al Hassan Al Basree, and many others.
You can also visit
www.kalamullah.com and under the lectures section, you will find various lecturers (of our era) speaking about many different topics.