I would check into the Gobal West Del-a-lum as you'll never have to mess with them after the fact as you may years down the road with rubber or Polygraphite... that would be the way to go in this case I would think?
You can compensate with the rest of the bushings if you need to get a smoother ride... or better yet by using a wider profile tire...
Unless you are going for all out handeling, then the ride stiffness is what your looking for, and then I'd also use the Del-A-Lum suspension bushings etc...
But yes, I'd go with the solid body mounts at this point.