Airport problems on new Core 2 Duo (network attachment delays)

I have just bought 17" 2GHz Core 2 Duo. Lovely machine, but I have some problems with internal Airport card.
After startup it takes about 5 seconds to attach to the WiFi network I run. Subsequently, if I load iChat automatically at login, by the time Airport comes online, iChat is already displaying "Network diagnostic" dialogue. After you OK it, iChat will not try to login anymore (as opposed to temporarily losing network after successful login where it will log back in on its own.)
Something doesn't feel right about this Airport on the iMac. After clicking Airport symbol on the top bar it takes few seconds for the menu to drop down and often accompanied with a beach ball. Ping time to a base station during these few seconds increase from 1mS to 100-200mS.
Things I have tried:
-Fresh reinstall of just basic OS X 10.4.7 from restore disks
-Using two different access points (base stations) - 3Com and D-Link
-WAP, WEP and just open network
-limit connections to 802.11b mode only (11Mbps and lower)
-Change WiFi channels and use interference robustness
-Use PowerBook G4 as a base station in computer-to-computer and Internet sharing modes
With all the above the behaviour does not change...
I have a stock iMac model with no custom options, modifications or peripherals. Signal strength is excellent.
My 17" PowerBook G4 in the same room boots up and wakes up into fully active Airport connection and it "just works" smoothly and transparently. So were all other WiFi connections I had here from Macs and PC over the years.
I have been using WiFi for 4 years and have done multiple installations including industrial networks, I am also long time Mac user so I have a feeling how it should work so I know my iMac Airport just does not work right.
I suspect it is drivers/OS issue. This is based on the fact that once established, the link works fine but as soon as OS tries to access the Airport card to reconfigure it (either at startup or prompted by the user), some hiccups and delays occur...
I wonder if anybody can confirm this behaviour or suggest something I might try to fix this... I want iMac to use WiFi as transparently as PowerBook G4.
Thanks for your time.
Leo

Thanks, smacman, the bridge solution is brilliant and would work perfectly from technical point of view, however, I am trying to showcase the "Apple experience" to some other people and at the moment I am not winning.
I am good enough to write shell scripts or even fix low-level source code in C or ASM but I don't want to waste my time fixing it...
I had a quick look and the problem seems to be with iMac's Airport being very slow during existing networks scan which REQUIRES dropping current connection as channels and modulation changes during the scan. I have locked my router to work in 802.11b mode only. If I could do the same with the Airport on iMac I am sure it would have helped a lot as no 11g or 11a networks were scanned and queried. Forcing it to connect to a specific network did not help. I can't find any file with low-level hardware settings for the Airport, otherwise I'd have a go at it. Maybe I should search Darwin community's help but most probably Apple only releases compiled binary for WiFi drivers with no access to source code or settings.
One other thought - 802.11 has a different frequency spectrum certifications in different countries and in certain areas allowed frequency range is limited. Maybe, forcing locale to e.g. France (where certified channels are only 1-7) can speed up things...
I have tried WPA2 encryption as well but I believe the problem is occurring during the network scan.

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