Jorge Sampaoli but I'd imagine he'll get some pretty big offers so I'd go for Marco Silva. Started the Sporting revival and now at Olympiakos. Good looking bugger too.
Just come back from Dortmund (went for the Mainz game at the weekend)... 82,000 in the Westfalenstadion is nothing compared to 16,000 faithful blues singing their hearts out, I'm sure. Bloody small-time german club.