x6000 vs zd8000

I am going for a good notebook.
The only real difference between the two that I can see, is
the 128 vs 256 mb of video ram for the graphic card, plus the zd 8000 comes
shipped with a tv tuner(external).
Everything else can be customised, so I am not worried.
Am I overlooking anything?
Is there a real difference between 128 vs 256 mb for a ati
x600 card? I dont think so....
Now what about the 3.2ghz p4 vs the extreme version?
Thanks X