Coach,
You might want to watch the Voice Lab post I started, we have several links to voice labs on Ebay and I hope we will discuss in detail all the equipment needed.
As with your CCNA study, it is important along with the books to practice what you are reading and having a good lab is one of the best ways.
Sims and emulators are great but connecting a network end-to-end and understanding all aspects from what the PC/ TCP/IP is doing to the switch and how the routers are communicating etc. This will only help in your understanding of the complex issues in CCNA.
And again, doing the same for voice, it is one thing reading about it, it is another to pick up your IP phone and call another station across the room, and know that you made THAT happen, AND you UNDERSTAND how it happened!!
Good luck!
E.A. Broda
CCNA, CCDA, CCAI, Network +