try A E Collars they have a good selection...i've got a 9 month old bitch not big enough yet...but i'll be paying them a visit when she is....they have a web site and you can order on line (pretty sure)....so what staffie you got then!!!!!
If you email me direct there is someone on another of my groups that make the type of collar you are after,I have seen some of his work and it is beautiful.