Well, that is just my opinion, others may think differently
But yeah, spells and such from those sources sound good to me (well, Dragon magic is (according to FR) mostly unusable by non-dragon wizards, but... Would be cool if we could assign magic to dragons at this point).
Arcane Age stuff is mostly engine-wise, anyway (would be very hard to do its engine in DC); monsters and such from that age are still around in modern FR, though, so you could still do those
