I know this is an old post, but I didnt notice it before. Black's are my personal favorite generic with grey's a close second. However I would not get them from anyone else besides TP or HK neither of whom use that email you posted.
All color tops are generic and likely come from 1 or 2 of the same factories. They switch up the color from time to time to have people thinking they come from different sources...quality varies. I've had very weak blue tops and very strong blue tops. Green/yellow/black/grey all hover about medium quality. Don't be fooled by labeled gh....you are simply paying more for stickers and labeling.