Hellboy
Hellboy and BPRD. Anything related to the Hellboy Universe.
Because of BPRD I really got excited about Guy Davis and his art so I've recently bought The Marquis which was an amazing book. I'm really looking forward to more.
http://themarquisinferno.blogspot.com/
Some classics for me are The Maxx and Watchmen.
Oh, and American Splendor.