I would find it impossible to rate the expansions - I love them all for different reasons. Base has all those, well, basic cards, and it has Chapel! Intrigue spices things up just enough, and how can you hate a set with Bridge, Trading Post, and Harem? I even like Saboteur - he's deliciously malicious. Seaside is just heaps of awesome, though Ghost Ship prevents it from being the all out favorite (curse you, Ghost Ship!). I've always liked Alchemy, and never understood why people get so pissy about the Potion cost. Prosperity is another heap of awesome, but having Grand Market in every game would get dull after a while. Cornucopia has such wacky cards - Tournament, Jester, and even Harvest just make the game more quirky. Hinterlands has cards that just make me giddy - I love Fool's Gold way too much, and I'll get Border Village even when I don't need to, like BV/Lab or BV/Stables - I mean, it's $1 Village - of course I'll take one! As for the Promos, the only ones I'd seriously consider getting would be Envoy (because it's serious enough - unlike the nonsense of Black Market and Stash) and Governor (because it's actually kind of good).