Depends how many machines you run, if you use cartridges and are happy with a one machine set up then there's a huge choice. If, like me, you use 3-4 machines then I recommend the Bavarian Custom Irons Transformator 239, it has 3 individually controlled outputs so no fucking about with cords and voltages. It's nice and compact and is solid as a brick. Have been using mine for about 2 years now and can't fault it. Consistent power and no problems. Also comes with a lifetime guarantee.