hey all. i have a peavey studio pro 112, and have herd that the speaker is pretty rubbish. i can get hold of one or two celestion/marshall wolverine 12inch 80w speakers, for a pretty good price, they are from a Marshall JCM2000 TSL602 amp. would one of these be a suitable upgrade from the blue marvel in my peavey at the moment? or should i get them both, and built a 2x12 extension cab, as my amp has an external speaker output.

any help would be great thanks