I don't mind getting away from the idea that all powers need to be combat-based.
While I feel the same, to allow a "social class" character to play alongside other classes it needs to follow the same rules.
LOVE that choice for Striker. Actually, I like these options for the roles overall. I'd put them alongside those suggested by andarilhor, above, as different options for the roles.
The problem I have with Gentleman, Noble, Aristocrat, etc. is that they are exceedingly broad (one could argue the same about "Fighter" and "Rogue" of course), and not discernable from each other. Moreover, they seem to rob the potential for a Warlord knight or a Wizard court magus (unless you are intended to multi-class into nobility).
A quick brainstorm about social powers...
* Possible power source names: social, esteem, prestige, status, influence
* Possible power type names (e.g. martial exploits, arcane spells, divine prayers): dictums, dominions, edicts, mandates, spheres [of influence]
* Powers derive from contacts/connections, reputation/respect or fear, psychological manipulation, and "macro/domain-level" policies (e.g. trade embargos, declarations of war, extradition treaties, safe passage edicts, etc)
* Powers typically target Cha or Will
* Powers could create zones which affect entire regions for a certain time
* Core class features might increase your sphere of influence according to tier (heroic - city, paragon - nation, epic - world)
* Powers could create connections between roleplayed dialogue and combat
* Powers could invoke "off-screen" events (e.g. courtesan confronts a death knight, revealing how the deathknight's second-in-command was compromised under the courtesan's interrogation, thus explaining how the courtesan knows the death knight's weakness)
* Powers may have the "Language" keyword, meaning the PC must speak the same language as the target(s)
* Powers may have the "Retainers" keyword, meaning the PC must have retainers at hand in order to use that power
* Powers may have the "Hierarchy" keyword, meaning the PC must use it in a culture they have social standing in, and attempting to use it on those higher up the hierarchy risks dire repercussions