Hard to pick only 10 
but will try my best. Haven't seen S8 and most of S7.
1. Rashomama (S6)
2. Play with Fire (S3)
3. Chasing the Bus (S2)
4. Caged (S2)
5. Kiss Kiss Bye Bye (S6)
6. Fannysmackin' (S7)
7. Viva Las Vegas (S5)
8. Table Stakes (S1)
9. 4x4 / Spark of Life / Who Shot Sherlock (all S5)
10. Pledging Mr Johnson / Boom / Evaluation Day (all S1)
Actually I loved most of S2 and S3.
Oh, and one more honorary mention: Let the Seller Beware (S3)
but will try my best. Haven't seen S8 and most of S7.1. Rashomama (S6)
2. Play with Fire (S3)
3. Chasing the Bus (S2)
4. Caged (S2)
5. Kiss Kiss Bye Bye (S6)
6. Fannysmackin' (S7)
7. Viva Las Vegas (S5)
8. Table Stakes (S1)
9. 4x4 / Spark of Life / Who Shot Sherlock (all S5)
10. Pledging Mr Johnson / Boom / Evaluation Day (all S1)
Actually I loved most of S2 and S3.
Oh, and one more honorary mention: Let the Seller Beware (S3)