I'm seriously thinking about a t-case parking brake...gets it out of the way and works on all four tires if your driveshafts and axles are intact. The original drums make the best parking brakes, anything in terms of a caliper with integral parking brake mechanism or internal drum-in-hat will be a step down in my experience, at least with respect to parking brake holding torque and performance.
As for parking brakes at the wheels, I prefer the internal drum-in-hat type since they seem to work better when set up properly. They also don't effect the brake performance, regardless of their condition, whereas calipers like the old Cadillac type require that you set the parking brake to compensate for pad wear.