I would go with the Carvins. 15 definitely. Don't even think about smaller speaker size unless you want your stuff sounding like it comes from a transistor radio.
I agree with you Peavey is by far the leading candidate. Pitching wise Jake Peavey is a stud
Peaveys are ok but Marshall makes alot better amp. Marshall is know for being loud and disorted.You can get the smallest ones that clip on your belt, or up to a triple stack.