Ok, so I think I could get by with a 9V since all LEDs won't be on at all times. Tomorrow I'll go buy a bunch of transistors and resistors and see how it goes. Thanks for all of your help, so far I am loving this forum!
One last thing: in the circuit diagram the emitter pin is connected to ground. Does that mean that the negative terminal of the 9V and an arduino ground pin should be connected together along with emitter pins?
Thanks again for helping a newbie get into electronics!