I am a fan of pretty much all that Pepin makes. Perhaps it is the similar flavor profile across the lines. They all don't taste alike but I think I like the varying amounts of pepper blended in with different flavors (say a Tat Cojonu 2k3 vs a San Cristobal Guajiro). There are some lines that aren't as good as others; yet my favs always seem to hit for me:
Tat Cabinet (aka brown label)
Tat Havana (aka red)
Tat P series
San Cristobal
601 Red, Blue, Black lines
Mi Barrio
DPG Blue, White, & Black
Vegas Cubanas
I need to hit a smoke after typing this!