IChat: Poor Audio and Video

Hi everyone, hoping for some insights into improving my connection.
Well, I've read everyting I can find and whilst I can now connect - (DON'T put iChat and Skype in the Login items) - I'm getting pretty unuseable audio and video.
Here's what I've tried and where I'm at:
QT streaming is at 1.5
iChat is on None
Mac Firewall is OFF
I connect via WIFI to a "FreeBox" - a combi router and modem here in France issued by my ISP.
For simplicity I've put my iMac in the DMZ on the router setup page.
The iMac has never run anything before 10.4.8
I do DHCP manually.
There is an AIrport Extreme card inside (AirPort Extreme (0x14E4, 0x87)
Wireless Card Locale: Worldwide
Wireless Card Firmware Version: 4.80.46.0
NO iChat add-ons
Bandwidth... the last speed test says 2,27 Mbit/s down and 136,17 kbit/s up
I Just tried chatting with defcom1 (thanks mate!) and it was really bad - from my end. At his it was apparently OK...???
Would really appreciate some thoughts on this
CHeers, Adam
iMac C2D 2GHZ Mac OS X (10.4.8)

Is this the speed your ISP is providing or was this
something that was recommended here on these forums?
This QT setting is as recommended here in the forums
Do you have a Direct Subscriber Line (DSL) or is it
faster?
Yes, it's a 2Mb DSL line
Obviously you are using the built in iSight camera
and the lighting is OK. Can you try an external
camera, possibly a firewire camcorder?
Haven't access to any other cameras...
Incidentally, I've never had to be in the DMZ but I
don't think this is going to be an A/V quality
issue.
I wanted to establish that this wasn't related to any ports not being open or whatever. Being thorough.
Any other ideas ?
I'm gathering strength to physically move the iMac down to the "FreeBox" (modem/router) and try the same with an Ethernet connection so as to rule out poor WiFi, but I'm not convinced about it.
TIA
AP
iMac C2D 2GHZ Mac OS X (10.4.8)
iMac C2D 2GHZ Mac OS X (10.4.8)

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