Can anyone please advise me of which polyurethane bush brands to look for and which to avoid - I know some of them are truly awful, and others are reputed to be good, and price isn't always an accurate indicator.
I've never heard any bad reports on the poly bushing made and sold by Great Basin Rovers. They're greasable and well made. I can't speak personally to their performance yet as I haven't driven with them since installation last fall.
They're not cheap. If you're interested in saving a few bucks you might ask about a run he made with course threaded bolts that he was selling at a somewhat discounted price.