2 spots left (B and M), Rook + Prem or Mid + Mid

[BigChief]

Struggling to come to a decision regarding the last few spots in my lineup.

I've gone for a pretty standard Guns & Rookies approach in the Backline & Mids.
I've got the same ruck setup most people have with Lueunberger at R2.
My forward line I'm taking a few risks with Varcoe, Byrnes and Mcaffer. Franklin, Rockliff and Martin should all have big years.

I've got 5 premium mids but am tossing up whether I go one more premium and another rookie in my backline (making 3 rookies starting on the field) or do I go two mid priced options (eg. Moloney and Atley).

I'm not too fussed about the extra money either one could generate, it's more the guaranteed consistency I should get from forking out on another premium.

Thoughts?