I've got my "tropical rig" that I fly to Coz and Roatan with, to keep baggage weight down. I got a new UL Mk25/G600 for the same reason. Other than that, stainless is the way to go.
By the way, Fred, at that rate of corrosion of Stainless, how long would it take until a FredT plate is dissolved into nothingness. I need to decide how many generations to plan passing it down through.
TBG, get a FredT. You won't be sorry. They are rugged, extremely well made, with none of that wuss-monger polish you might get on a Halcyon or other brand. FredT's are becoming a status symbol. They are all function. Sort of the Peterbilt of backplates.