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I'm still debating whether I should hold out for the legendary edition as it will eventually hit $19.99, which means an eventual 75% off price, which means more than a solid week's worth of gameplay for 5 bucks.
Dawnguard adds crossbows, the awesomely atmospheric Soul Cairn, one of the most well written companion characters in a WRPG, and it actually makes lycanthropy and vampirism not suck by adding cool perks. Also, the Aetherium Forge quest was really cool.
Hearthfire is good if you want more immersion and enjoy building sims.
Dragonborn is easily the best. It adds an entire new landmass full of quests, loot and dungeons, the villain is cool and menacing, and you can get a whole slew of cool abilities, spells, perks etc.