Massive horde consisting of Bloodmage and Phiarlan Phanatasmist. Academy master is any arcane class, ditto Master of flame; Divine oracle and Life singer are from other classes; Planeshifter is solid, but nothing spectacular, Arcane wayfayer is quite good, but doesn't sinergise well with any build; Bonded Summoner and Rimetongue Caller are nice, but only for summoners, and could be better - summoners will take them because they are synergistic with, well, summons, and not because they are at level of Bloodmage, or Divine Oracle.
EDIT: And Fighters are relevant because three of four Fighter paths in PHB were very good, and still are, and very well matched with each other. On the other hand, they did get a lot of worse paths afterwards ... Perhaps Wizards think Kensei and Swordmaster are too powerfull?