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I personally would get them after you finish the main quest only because that's how I did it. I would also buy them in the order they originally came out. First, Dawnguard. Second, Hearthfire. And third, Dragonborn. Just my two cents...
You can skip out on Hearthfire unless building your own home is something that seems very appealing to you. Dragonborn and Dawnguard are both great DLC's, but if i could only pick one I would pick Dragonborn.