Here is my current collection of watch bands that I use with my 42 mm Stainless Steel Series 3.
Left to Right:
(1) Juuk Revo in brushed Stainless Steel
(2) Juuk Locarno with a mix of polished and brushed stainless steel links
(3) Lucrin band, smooth leather in White with contrasting red stitching
(4) Lucrin band, smooth leather in Mouse Grey with matching stitching
(5) Lucrin band, smooth leather in Navy Blue with matching stitching
(6) Lucrin band, goat leather in Tan with contrasting white stitching
(7) Lucrin band, goat leather in Royal Blue with contrasting gray stitching (Elegance Model)
(8) Lucrin band, goat leather in Dark Taupe with contrasting white stitching (Elegance Model)
(9) Apple Sport Band in Soft White (this came with the watch)
(10) Juuk Vitenza Onyx, a new model with perforated black leather with red edges and silver hardware.
If you are looking for metal bands, the Juuk models are some of the best out there. Not cheap, but top quality. They just came out with a leather line as well, with deployat clasps (not buckles).
www.juukdesign.com
Likewise, the Lucrin leather models are hideously expensive, but extremely nice. The best part is that they offer a bewildering array of leather colors, types, and customization options so you can go crazy!
https://www.lucrin.com/apple/applewatch.htm