What hand blender matches the Bamix in quality and performance?

I have read that the bamix hand blender creates the best vortex to the speed of its blades and is considered by many as the best in the world. But although I need a performance like this for my soap-making endeavour I cannot use a bamix because their cutterguards are made of aluminium which reacts badly with lye (caustic soda), an essential ingredient in soap making. Thanks.