I also purchased most of my metric bells from Perform Better, I like the ones that are vinyl coated because I like the all the colors
, but they are my favorites because I find the handles the perfect size, and they are smooth. I have the 6, 8, 10, 12, 14 kg. Then I filled in some gaps with Power System bells at 20 pounds, 35 pounds and 45 pounds. For some reason the 12KG handle is a big larger and bumpier than the rest.
Sign up on their sites to receive specials, I just wait for a sale, especially one with free shipping before I make additional purchases. Sometimes if I leave stuff in the Power Systems cart, I get those ads when surfing to come back and purchase my cart with 20% off and free shipping, that's how I got the 45 pound bel.