Easiest Roles to get an S in?

So, I have 3 champions at mastery 6... Akali, Sona, and Soraka... so it made me wonder what roles are easier to get an S with.....

So I categorized them as:

Top Lane

Ganking Jungler (Junglers that would usually get enough camps to get to a certain level and then gank constantly...)

Farming Jungler (Junglers that farm their... and at times the enemy... jungle until mid-game when they jump into a teamfight and become the terror that they truly are.)

Mid Lane

The Bottom Lane Carry (Since I see and often play AP champs there too, I make it less specific)

Caster Support (Supports that GENERALLY aren't in the middle of the fray and therefore aren't going to die much...)

Tank Support (Supports that Function under the concept of, "I die so you don't have to because I am a pain in the butt".)

EDIT: I voted caster support for the sake of seeing votes and the fact that most of my S's are on caster supports....