If you want to show, then it has to be pedigree, but one thing I would say is that I have more problems with my pedigrees than with anything else, with the exception of my few remaining shouthdowns.
I have had or still have dorset downs, poll dorsets, south downs, lleyns, texels, suffolk crosses, jacobs, portlands, zwarbles and my new highlander (super dooper special sheep).
I agree with fleecewife - you need ones you like and start from there.