i want buy new computer. Help ME!

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hi evrybody. I need new computers! One personal computer and one laptop for my job!I dont' know nothing about hardware and computer brand. I need Advice. i don't want spent more thne 3.000$ for both computer!My friend tell me abou "DELL" for laptop! I work with graphic program like "CAD" and "photoshop" and i transferr a lot of file by internet. Which characteristics i need principally!please advice me!tell me abou personal computer and laptop characteristics and brand!THX evribody!