New Airport Extreme not working with my Quad Macpro

Hi all-
My Linksys 902.11b router finally died and our household is now completely Mac-based (all with Airport Extreme cards), so I decided to take the plunge and get an Airport Extreme.
2 of the machines on my home's network are doing fine with the router and are getting good speeds - iMac Dual 2.4 (10.5.1) - Both the wired and wireless connections are solid with this machine / Macbook Dual 2.0 (10.5.1) - Both the wired and wireless connections are solid with this machine as well.
I have a Macpro Quad 2.66 machine running 10.4.11. I cannot upgrade to 10.5 yet on this machine since it's being used in my recording studio business and there are known issues with some of my apps and 10.5 at the moment.
The Quad can see the network and has seemingly strong signal from the Airport Extreme BS, but DHCP reception is inconsistent (the machine often eds up using a self-assigned IP for some reason) and IP connectivity in general is inconsistent, even when an appropriate static LAN IP is manually setup. I can often get to a few webpages while using a manually config'd IP, but only with very slow DL speeds and then the connection quickly disappears and drops out entirely.
The AExtreme is setup like this: DSL Modem-->Airport Extreme (config'd with a static IP from my ISP) -->DHCP broadcast dummy IP's to my network. Currently I've not setup any security since I'm in the process of troubleshooting and I don't want to further complicate the situation. Radio-mode on the AExtreme is set to 802.11n (b/g compatible)/Channel 1. I've tried numerous config setups on the AExtreme, but none have helped the situation.
I've also disabled IPv6 on all clients per some reading on the forums of possible issues.
Anyone know what the problem might be? Is it perhaps an issue because the Macpro's using 10.4.11?
FYI, I've also also got an extra Airport Express around that's not being used that could be used as a repeater/wired connection downstairs if broadcast strength is the issue, which seems somewhat unlikely to me. I'm not sure how to config the AExpress to work in this capacity though, so if anyone could point me to a tutorial I'd appreciate it very much.
Thanks in advance.
Lee

I just did some more testing using an app mentioned here on the forums, iStumbler. The app offered these details:
- Signal Strength is between 45%-56%
- Noise is between 24%-41%
- Freq = 2412
- No websites load despite it's seeing the router and saying we've joined it.
I also did a screen capture of the iStumbler's screen in case that's helpful. There were several bits of info I wasn't sure about.
Here's the screen grab: http://www.pbase.com/infiniteposse/image/91793322/original
Thanks again...

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