I had Steeda offset rack bushings, they wore out and made just as much noise as my stock rubber ones did. Plus they rotated in the mounts and caused my rack to be off center effecting the toe. If you're going to get replacement bushings get center mounted bushings. I love my aliuminum center-drilled MM bushings; no noticeable increased noise or vibration over urethane or rubber. I've used all of these solutions, and the aluminum center-drilled bushings are by far my fav!
On a side note, while not necessary, it's much easier to install the rack bushings by fully removing the steering rack. To do so just buy/rent a tie rod end popper (the clamp kind, not one of those crappy forks, i got mine for $10 at autozone) and pop the ends off, then you can pull the rack alot farther out making the rear bushings WAY easier to install (if installing rubber/poly bushings rears are replaced too).