Buy the PowerKey Classic. I purchased one for my SE/30 in May 2007, direct from the manufacturer. They still had stock at the time. It works beautifully. Since I live in Japan, a country that trivializes the importance of an earth ground, I asked Sophisticated Circuits about compatibility. Here is what they told me:
Japan also uses 100V power at either 50Hz or 60Hz (depending on where you live), but the PK Classic works just fine for me.