Yes, I also think it's the best book ever written. But the strange thing is when I read other authors and I love the book they wrote, I always read everything else from them. With Bulgakov it's different. And as I see it was the same with you. I don't know why, maybe we are afraid of cracking the perfection of his masterpiece.

Nabokov is a mandatory author. You will be surprised by his book "Invitation to a Beheading", which I recommended. The book have from Kafka's spirit, but not only. It's original and in my opinion it's the greatest work of the 20th century.