Order of favorite: {ep 1x01 & 1x02 not included}
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
11)
12) 1x12 - Crash Course in Polite Conversations
13) 1x18 - To Wish Impossible Things
14) 1x14 - I Shall Believe
15) 1x05 - All That You Can't Leave Behind
16) 1x04 - Crash Into You
17) 1x21 - The Leaving Song
18) 1x07 - Life in a Glass House
19) 1x16 - The First Cut Is the Deepest
20) 1x06 - Every Night Is Another Story

I hate to choose this episode, because it was sooo cute,
but the others are just better.