I got a SUT from these guys: http://www.sacthailand.com/transformer_mc.html They were recommended to me by someone with a lot of experience with SUT. For a small additional charge, they will do a custom winding to match your cartridge if that is needed. I am happy with mine but it the only one I have ever had in my system so can't compare it to anything else. They speak English and were very easy to deal with.
