I have a Luxman 509u integrated 100v and have been using for years without issue. Save the money and buy 100v. Some units can be converted by changing a few jumpers and adding a 120v sticker. There is a guy in Wisconsin that tried to help me over the phone but he ended up needing to physically see it. Wasn't worth me shipping and he agreed. Sorry I don't have his contact info.
I am looking for an Esoteric piece that is $7k new from Japan (100v) and $11k from a US dealer.. When I pull the trigger, I am sure I will need another voltage converter.