My son and I are building a 4x4x4 cube. We have been planning to use a pair of mm5451 source drain chips to select the columns and were thinking to use mosfets to select and power the tier .. thus lighting the desired LED. 

Since the 5451 acts as a current drain .. I am searching for a P channel MOSFET to energize the tier by using an output of the 5451 to bias the MOFET on ( it being connected to a external power supply to manage the current draw). 

Is this the best approach? 

Assuming yes, what would your suggestion be for a good P-chn Mosfet? ( most that I have found that will handle the external voltage/current, require more than a digital 0-5v system can put on the gate).

Thanks in advance for your help..