Hi
If you can't get a personal recommendation on here then it might be a good idea to attend a show for a closer look. If you choose a biggish Championship Show you'll get a chance to have a look at your breed in the ring, ask other owners/handlers what they use, and get a feel for your preferred option. Finally you'll probably be able to buy one there and then!
I don't use chain for my breed so I can't help on that score but if you want to look online then
Hessonite is quite a good place to start, they also have a list of shows they will be attending