Melee/Armor ATs have more options. Blasters: 15 blast sets, 15 manipulation sets. Scrappers: 21 melee sets, 14 armor sets
Actually, Defenders have more options with their support powers (16) than Blasters have for their secondary. The real weak spots are Control (10) and Pets (7). --edit, Assault could use a little love too with (12).
Devices>>Field Operative: Toggle: Self Stealth, +Defense(All), +Special, +Regeneration, +Recovery [I see you already covered that]
There are also Touch of the Beyond (-ToHit), Dynamo (-End), Frigid Protection (-Recharge), Reaction Time (-Recharge), Drain Psyche (-Recovery), Kuji-In Toh (+Res [Psi]), Wild Fortress (+Res [Tox]), & Sound Barrier (+Res [Sma, En])
Half the sustains have some level of built-in mitigation...