Unverferth, in their Town and Country Ltd. "Freedom Line", makes a 2-shank ripper/subsoiler, very solidly made and capable of going deep, that would be about right for your size tractor. I have seen the one shank version and it is solid. The shank is a parabolic curve which uses less hp than a simple straight shank. They are shear bolt protected too, not like the cheapo stuff at chain stores.
Worksaver makes a nice 1-shank subsoiler with similar features, but I imagine you would want a 2-shank.
Baltic (A/S Baltic Korn of Denmark) makes a chisel plow in sizes from 5 to 15 shanks, with spring trips and 3pt mount, called the Baltiboy all purpose plow. Based on their brochure you would probably want either the 13-shank version (10'8") or 15-shank version (12'3").
In my area both these lines are available from virtually any tractor/implement dealer that sells real farming equipment, though they often aren't stocked but just special order from the distributor.