Obviously there is nothing quite like Susanna Clarke's magnum opus. However, the style has been described as a cross between Jane Austen and Charles Dickens. Would Dickens's ghost stories or Austen's Northanger Abbey be worth trying for a quick fix between readings of this? I would suggest Kingdoms of Elfin by Sylvia Townsend Warner and possibly Lud-in-the-Mist by Hope Mirrlees.
I'm working my way through Dr Strange at the moment .Its seriously slow,but if you like this you will probably love the The Quincunx by Charles Palliser..its a bit too long but is a brilliant read and seriously gripping