"Perfect" Feats

[Draz74]

In Core,

• Improved Initiative
• Combat Reflexes
• Rapid Shot
• Empower Spell*
• Extend Spell*
• Heighten Spell
• Maximize Spell*
• Quicken Spell*

... strike me as the most-balanced.

With "Honorable Mentions" to Improved Trip, Augment Summoning, Improved Critical, Cleave, and Two-Weapon Fighting. (Improved Trip is mildly too good; the others are mildly underwhelming, though certainly not "bad" on the right builds.)

*Assuming you don't combo them with metamagic reducers.