Wow Amypie,
The way you described your MT sounds 'bang on' similar to my new English Toy Terrier. Derived from the Manchester and Whippets. With one exception being that I am having a little trouble socialising the little fellow. He initially had no interest at all in other dogs and appeared very much 'stuck up' or snobbish. He's starting to playbow and play growl at other dogs now after meeting them 2-4 times - thank god.
Anyway - felt compelled to reply due to the similarities.
Heres a pic of Ripley - Hes 18 weeks old now - this pic is prob at 14 weeks old. (hope it works)
So back to the opening poster - Manchester Terriers are GREAT but The English Toy Terrier is worth considering too