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Question: Dell XPS 430-121B vs HP d5200t or HP m9600t purchase

please help me make up mind on purchase of dell XPS 430-121B from Best Buy versus HP d5200t or m9600t. I'm reading that the motherboard is a problem within 2 yrs with the dell and the Hp products are plagued with freeze and hang and sleep mode challenges. All three about same price. Have seven yr old dell dimension now-do not play games, but multitask programs. Thx