Top tier S tier:

S2E01 - American Duos
S2E13 - Lights, Camera... Homicidio
S2E15 - Black and Tan: A Crime of Fashion
S5E02 - Last Night Gus
S7E03 - Lassie Jerky
S7E05 - 100 Clues
S7E08 - Right Turn or Left for Dead
S7E11 - Office Space
S8E01 - Lock, Stock, Some Smoking Barrels and Burton Guster's Goblet of Fire

Next Level S tier:

S3E08 - Gus Walks into a Bank
S4E09 - Shawn Takes a Shot in the Dark
S5E12 - Dual Spires
S6E10 - Indiana Shawn and the Temple of the Kinda Crappy, Rusty Old Dagger
S8E10 - The Break-Up

Ground Floor S tier:

S1E01 – Pilot
S1E10 – From the Earth to the Starbucks
S1E15 – Scary Sherry: Bianca’s Toast
S4E01 - Extradition: British Columbia
S5E06 - Viagra Falls
S5E10 - Extradition II: The Actual Extradition Part
S5E13 - We'd Like to Thank the Academy
S5E15 - Dead Bear Walking
S6E03 - This Episode Sucks
S6E11 - Heeeeere's Lassie

Thriller S tier (in a tier of their own):

S3E16 - An Evening with Mr. Yang
S4E16 - Mr. Yin Presents...
S5E16 - Yang 3 in 2D