Make sure that your new laptop will support the RAM from your old one - if the old one has a lower frequency, then system performance will be slightly compromised. The Core Duo is much more efficient when it comes to battery life and it also runs fast. I don't know exactly how it will compare to the P4 2.8GHz but I guess it should be just as good if not better. Maybe a higher clock rate will perform better.
I think you can configure your system online - not sure if you can buy it online though. It would be a good idea to configure your system online so that you get a rough idea of the final cost and then call them up.
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