Oh, you're watching for the first time?! How far are you?
Well, I really love the early seasons. There are so many wonderful Meredith and Derek moments. I love the bomb episode, as a whole, but especially their exchange at the end where Meredith says she can't remember their last kiss and he describes it and says her hair smelt so good, but he doesn't know what it was and she's like "lavender"
Also, I love Izzie so much and I am really sad that she never came back. I loved her relationship with George, but nothing beats Cristina and Meredith. Their friendship is one of the best, if not the best, friendship I've ever seen on TV. I also love Alex and Meredith's friendship.