Virtual Network

I'm looking for a product that will capture my WAN/LAN device configurations and allow me to test routing, firewall, vlan changes etc.. in a virtual environment before putting any of the changes into production, similar to a test environment programmers might use.

I've looked at the Cisco product, Network Planning Solution. That product significantly exceeds our budget at over $250K, plus an Oracle license.

Another product I am presently looking at is Gambitcomm?s Mimic software. It may meet our needs, but I was hoping to have other options to evaluate. Can anyone recommend an alternative product?