Menard will never sniff a win. Once his contract expires with TEI, he'll be done in the Cup Series.
Reutimann; see Menard.
Ragan will have the equipment to get it done, but I'm not sure he'll be another Kenseth, Busch, Biffle, or Edwards in the Roush talented pipeline.
Montoya and Allmendinger are definitely the two best and most talented drivers in this class.
Hornish probably has the best chance since he's already running stockcar races for Penske. Danica will probably give it a try sometime after she feels she has ran her course in IndyCars. Haven't heard anything about Wheldon even being interested in NASCAR.