No races leap to mind.
The Sorcerer can't ever really have enough sub-classes and I'd personally like some take on a 'Weaponmaster' fighter, but aside from that there's been a lot in UA, enough that I'm happy to run PH-only games.
There are still some full classes missing: the Warlord's the only one missing that was in a PH1, the Avenger, Shaman and others were in a PH2. There's classes like the Warden, Warblade, Swordsage, Swordmage, Knight, Scout, and others that are represented only by a single sub-class, and that perhaps tenuously. The Mystic is trying to be all psionics, but covering Psionicist, Wild Talent, Psion, Phychic Warrior, Soul Knife, Ardent, & Battlemind is kinda a tall order.
And, yeah, I'd like to see PrCs. There are some concepts, particularly setting-specific ones like the PDK, for which they are ideal.
It's not about limiting yourself, it's about limiting everyone else.