I've heard great things about Ewing. I believe he wrote some Avengers books awhile back that I enjoyed. He or Alan Davis would definitely be at the top of my list. As the other good friends here on the board mentioned, his Fantastic Four The End was excellent with him writing and illustrating the book. Its always been in my top ten list of runs through Fantastic Four's history.
Ah well, i guess we can cross off Al Ewing as a choice - he's been tapped to do the new relaunch of the "Immortal Hulk".