Dell are ace. But watch out for the small print. Their Desktops have a 3 year warrantee, their Laptops only get a 1 year. (This is UK versions).
A good trick is to get onto their website and buy one of their 'refurbished' jobbies. A lot cheaper than the latest thing, same warrantee and they are as good as new.
www.euro.dell.com will do it.
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400 Hertz but DC is easy