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My thoughts are:
1. Buy a Core Duo, dual core, laptop even if you have to stretch a bit.
2. On my x2 3800 Athlon desktop with 2 gig of memory, I don't see more than 1 gig of memory used so you would have to do some serious Photoshop work to need 2 gig. Memory is easy to add and often much cheaper from a 3rd party, even a Best Buy or CompUSA, than the manufacture when buying the laptop.
3. Get a real graphics chip not the built-in Intel graphics - nVidia 6150, ATI 200 or x1300/1400.
4. Get a DVD burner in your laptop. Some laptop DVD drives will also work with DVD-RAM media - preformatted 4.7 gig media that works like a very large floppy disk.
5. If you can put up with a 13" screen, Sony has several really nice notebook computers in the 2 kg, 4.4 lb, weight range - Core Duo, x1400 graphics,
Yes, one can really notice the difference between a 2 kg and a 3 kg or 4kg notebook when carrying it around. I have luged around a Dell Insperion 8000 for many years, 4kg plus travel weght. Now at work I am using an IBM T41 Thinkpad, about 2.5 kg travel weight.
best of luck, Nigel