The intelligent RGB strips have a limited clock frequency. I don't see why an Arduino should not be capable of transmitting the color information. Let it set up the data lines for each strip, then apply a clock pulse to all strips at once. This way a single 8 bit 16MHz AVR can program 6 to 3*6 strips at the maximum strip clock rate. The magic "6" here reflects the available port pins of the typical 328 controller. No use for a controller that is so much faster than the LED strips are.