I currently own a 12 month old bitch,staff bull terrier and i am looking for another dog, any suggestions on a breed which is going to get on with my staffie???

Not sure about the breed but a male may be the best choice, but you will have to either spay the bitch or be prepared to send one or the other to kennels twice a year.

Guest, you don't mention anything about you or your family or lifestyle. Or what you want from a dog. Excercise levels etc. So it's difficult to try & advise what would be a good dog for you.
I'd think most dogs would mix with a well socialised 12 month old stafford.  Good luck.
Why don't you register & tell us more?  :)