We use N.O.K. brand oil and dust seals whenever possible. N.O.K. seals are the choice of every major manufacturer as their OEM spec equipment. Cheap seals either fail extremely quickly or cause significant amounts of stiction. Stiction is the enemy of front suspension, delaying the response time of the fork.
We polish all fork stanchions prior to fitting new seals, to remove any damage and reduce stiction to a minimum.
Seals and dust seals should always be replaced as a set. The dust seals' job is to protect the main seal, if the main seal is damaged then it's highly likely that the dust seal is also damaged.