I'm not really keen on the idea of using a fixed full rpm router or at best a few set points of rpms for a spindle. So I was intending to use a spindle and power supply for my build. I've found a few spindles rated from 300w-600w and 48v-110v that would seem to be capable of light aluminum work. What have you guys seen as a good spec point for aluminum work? Much past the 300w mark though most switching power supplies just don't provide enough voltage. What do you guys use for power supplies at that point? Was hoping to avoid VFD's at this price point.