Todd Marino. 2010 in the Sweetney path. I picked him up in the 4th or 5th round if memory serves, even though I had a decent FB (I'd moved willie parker from HB to FB, and he did surprisingly well there even being a bit small), and he's been amazing. He blocks for Sweetney, he runs it himself, and he even receives! He's made me several clutch first downs out of nowhere.
I've had some of the other stud FBs in other draft paths in other careers, and none of them have done for me what Marino has done. Having yet ANOTHER receiving target on the field drives opposing defense nuts. They simply can't cover everybody, my passing game is a brute force machine this season.