Hello Michael,
It would be awesome if you get one as this will help you with not just the CCNA security fundamentals but also on all of the CCNP Security Track.
If you have the money go for it.
Note: Do not go for the PIX, you will be waisting your money as no certification uses that now days
For more information about Core and Security Networking follow my website at http://laguiadelnetworking.com
Any question contact me at jcarvaja@laguiadelnetworking.com
Cheers,
Julio Carvajal Segura
Julio Carvajal
Senior Network Security and Core Specialist
CCIE #42930, 2xCCNP, JNCIP-SEC