What is the best voltage regulator for portrait and airbrush machines! Price in what position!

With servo (scv) system is better, 110v ultra-low voltage start, undervoltage, overvoltage protection, high-precision voltage regulator, suitable for computers, medical equipment, precision equipment, instruments. Recommended brand Deli West, Chint, the price depends on how high power. 10kva about 1500 yuan it.