I have many favourites. Here are a few of the vendors that I frequent,  In no particular order:

Batlab
Powerage
3D-Age
9mbi
Aery-Soul
Yanalis3D
aoaio
BadkittehCo
BVH
Billy-T
Prae
DamageInc
Hongyu
Jasmina
Lovely Lady
CJ-Studio

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi