I have used most mentioned.
My personal favorites are anything pre 2002 Marzocchi. My preference is the models with the bolt on bridge. The look and function is unparalleled. Also so easy to service.
My RAC is still going strong, although it sees very little ride time recently.
All my rides have Marzocchi except one. I cannot bring myself to swap out the Amp Research F4BLT on my Moho. It just plain works.