Cisco ASA 5500s

I am learning Cisco ASA in pursuit of  CCNP Security certification. And what a platform this is!
Firewall, Remote Access VPNs, Virtual Firewall, Botnet Filtering, Anti-X, DOS prevention, user-based access control, URL filtering,  IP Routing, NAT and what not!! WHAT NOT!!
If Routers are not cool enough for you, here are the Cisco ASAs.. WoW!

So, Currently Cisco rolls out various flavors of ASAs with varying performance, scale to meet requirements for businesses of all sizes.
ASA 5505, 5510, 5512-X, 5515-X, 5585-X

Google out "cisco asa" and visit the first link. There's an ocean to dive into after Routing/Switching for me now.