My preference would be Elephant Racing "Sport Hardness". These are perfect for street application as rubber, no matter the hardness, is softer than steel bearings.
I just replaced mine about 6 months ago and the car's handling changed tremendously. Specifically, the car no longer felt like it was occasionally steering with the back wheels. This also changed my ride height by an inch or so, so all of that will have to be re-adjusted and then aligned.
My old bushings crumbled to pieces when I removed them and the new bushings had to be pressed into place. I did this with a large bolt/nut and giant washers.
Elephant Racing is a very good product and I have replaced all my bushings front & rear with ER. If you are doing this yourself, they have tutorial videos on their site as well as YouTube.
Rear Training Arm Bushings - Pressed in using large bolt/washers:
Old Bushings compared to new:
