I ended up going with standard rubber bushing from Atlantic British.
Doing the Watts link and Panhard bushings as well.

I have to say... the bushings in Tony's arms look so good, I was really tempted to just run them. But I guess afer 280K(!) miles, time for them to go!

 

Factory rubber bushings ride well. However, any failure makes it hard to replace in the bush. It had occurred to me when we were a few days away from civilization. The pic is me last year when the radius arm bushing failed. Not fun when the radius arm is clunking away metal on metal for a few more days of offroading

I am still just a year into the Powerflex.The Powerflex has a higher hardness rating than the factory rubber. Rubber generally rides better than poly in general. My OME heavy-duty set up adds to the harshness. The two piece design helps with field replacement.