Garthanos
Arcadian Knight
there are a number of feats that I consider borderline feat tax. You don't have to take them in order to be effective, but they're good enough that it's hard to justify not doing it:
Expertise (before 15th level)
Paragon Defenses (all paragon characters)
Action Surge (all humans and half-elves)
Backstabber (rogues)
Lethal Hunter (rangers)
Nimble Blade (rogues)
Weapon Proficiency (all weapon-users who can get a damage die upgrade by taking a superior weapon)
Leather Armor Proficiency (all characters who don't have it already)
I think you are meandering into well just good stuff.. the leather armor annoys me because it is too often against form for the ones its most useful for... I want the shieldmages warding to be be more available.