I think its great, all of these suggestions, but I would argue that Steinbeck isnt as "hardcore" as Faulkner. Both were exceptional writers, and either would be suitable for your reading enjoyment. Both are hardcore writers and in turn it is up to you to decide which you enjoy the most, and to that; which give you the most challenge. Good luck!
Hey, Virg! I saw your D.H.L thread! Greatest writer ever! Great thread!
Asa