I have a router/firewall - do I need an AirPort Extreme Base Station?

My current home network consists of my iMac, a Linux box that I use as a server, and my work Windows laptop that I connect to my home network via an Ethernet cable. I have a Netgear router/firewall. I don't have wireless access to my home network yet.
I'll be getting a new Apple laptop of some sort in the near future, so I am interested in adding in wireless. I'm used to the firewall capabilities of my Netgear router/firewall, and am confortable mucking around with netwrok configurations.
I would imagine that if I get an AEBS, it will take the place of the Netgear router/firewall. I also figure that I can just get a wireless access point to add wireless capability to my network, but that would mean a second box.
What I would like to know is how configurable are the firewall functions of the AEBS. With my current router/firewall, I can do the following:
1. Define what ports/services I would like to allow (FTP, ssh, etc.)
2. Set times as to when those services are open
3. Direct incoming and outgoing services to specific IP addresses on my local network (if an FTP request comes in, it automatically goes to my iMac, wheras ssh goes to my Linux box).
Can any/all of these be done with an AEBS?
I did try to ask the people at the local Apple store, where I was informed that the AEBS actually did not have any firewall capabilities, despite what the box says, and that I should rely on the Sharing part of System Preferences.
iMac G4 1 GHz   Mac OS X (10.4.4)  

The AEBS does not have built in firewall software as the retaili folks said.
You will be able to set up port forwarding those so specific ports coming to your public IP address getting routed to a specific private IP address (your iMac vs. Linux box example). However, you can not associate certain times for these functions to occur....
...unless, maybe, an Apple Script was created to upload an alternative configuration to the AEBS. I'm not sure though; just thinking outloud. Maybe one of the Apple Scripting guru's on this forum could take the lead on that idea.

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