[ubuntu] New PC configuration suggestion.

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http://ubuntuforums.org – Hi friends, My home PC is pretty old (1.8 Ghz P4 processor, 40GB HDD and 128MB ram). I want to reassemble my PC, but I cant invest lot of money into it. From what I see the major components I need are MotherBoard, Processor, RAM and HDD. Can anyone please name some companies and model numbers of the hardwares which work well on Ubuntu/Kubuntu or *buntu. I also have some queries regarding performance of processors. I was planning for Intel i3 processors. I heard that AMD processors are cheaper than Intel processors. Are AMD processors as good as Intel processors? If yes, which processor is (Hardware)