Unfortunately we can pretty much rule signing Lester or Scherzer, as they are going to get 6+ year contracts. Blue Jays policy is to not sign any contract longer than 5 years.
I wonder if a package where Navarro is included to the Dodgers for Alex Guerrero would work.
There is a lot of good bullpen arms in free agency this year. If we are going to go with a younger rotation we better have a very strong bullpen.
Miller or Robertson would be good anchors but are going to be costly. Instead we could sign a couple of guys like Motte, Hochevar, Grilli, Romo, Lindstrom and one of them could end up being as good as Miller.