I fourth you all, but I must say that my all-time favorite was the MAC x Diana Ross collection. It was my first time buying ERRYTHANG. It is the first time I could use everything. I went far to get it - had my local MAC SA call and put it on hold so it would be there and they knew I was serious. I grabbed a friend, drove the three hours to get it, and were pleasantly surprised to find out the counter I went to for the purchase was hosting a class with a national artist (his name was Christopher and until recently he was one of the US artists on MAC's website) and he did my makeup! I was stoked - I made a day of it. My very favorite bright pink blush ever was part of that collection.