You might want to add NOS 50's GE triple mica black plates to your list. I tried the RCA and liked them but overall I thought the GE's were a tad smoother or lush and not quite as dry sounding. Don't get me wrong the RCA's were good but I just preferred the GE's. I compared both of these in a Jolida CD player.
Blindjim here has a Thor preamp. You might want to give him a shout.
Blindjim here has a Thor preamp. You might want to give him a shout.