Rick,
You can use one power supply and split the voltages with various means, but, it is far simpler to use seperate supplies. One as "apache" suggested for the controller and driver logic. Another for the stepper power at 36 volts. The current requirement rating of the 36 volt supply will be equal to/or more than all five of your motors combined (Because they can run at the same time) i.e. 2.6A x 5 = 13A or greater. Your motor size ,as he mentioned, depends on your use. If you are looking for the biggest your system can handle than you can get 5 "nema 34" motors rated @ 2A with 450 oz.in. holding torque from
www.stepper3.com for a little over $90 apeice. If you check other sites like "keling" and others, you can probably get them cheaper.
Stephen J