I've played 3 out of the 4 and also love them a lot. If I may make a suggestion - for me, Dominion's first expansion (Intrigue) is a very worthy addition. The cards are more conflict oriented, leading to more interaction between the players. Some are actually rather nasty, but we are talking Dominion after all - if you really hate one or two of them, leave them out and that's it. I've only seen people play the second expansion and have not played that myself, but it looked like the game was heading towards "unnecessary game mechanics that really bloat up the game" land full speed there.