Eladrin are a bit more versatile than standard High Elf, roughly the same power level. idk how does this work with the DMG version?
Githyanki are very strong, better than Vhuman in some cases, better than the PlaneShift pseudo V humans with the picks already made.
Githzerai ... lemme whine about the fluff LN instead of CN ... Druids in wildshape form can use that +1 AC right? If so here's the best druid race. If you go Monk 4 elements there should be some interaction with the spells (I don't think they've bothered with that part, more of a multiclassing improver feat type thing, whenevs, xanathar's perhaps).