I'd probably go with one of the STL forwards and Mueller. Silfverberg's four games would be nice but at the same time he hasn't exactly shown himself to be a quality start just yet.
Or you could go boom/bust and hope that STL obliterates their opponent in the two games they play
Mueller and Silfverberg for me because of games played. That said even with two games McDonald could still be the best of the bunch, I just prefer having more games covered.