Wuthering Heights - Emily Bronte
The way we live now - Anthony Trollope (incredible resonance with today's world)
Great Expectations (the only Dickens I can manage)
The Forsyte Saga
Anna Karenina

if you were thinking at modern classics I'd say:

Possession - A S Byatt
The Great Gatsby - Scott Fitzgerald
Gone with the wind - Margaret Mitchell
The Shipping News - Annie Proulx