This is really close to my own guidelines. I allow most things so long as the player talks to me about them; if they seem broken (and nothing has yet), I take a closer look.From my house rules doc:
Allowed Rule Books: Player's Handbooks, {power source} Power series, Eberron Player's guide, Forgotten Realms Campaign Setting (Swordmage, Genasi & their related feats only).
DM Approval Required: Adventurer's Vault, Dragon Magazine, Monster Manual races.
Banned: Weapon Expertise (PH2), Implement Expertise (PH2), Focused Expertise (PH3), Versatile Expertise (PH3), Hide Armor Expertise (Primal Power).