I'd be tempted by a secondhand Lenovo X220 Maybe something along these lines http://www.ebay.co.uk/itm/CHEAP-FAST-Lenovo-ThinkPad-X220-i5-2520-2-5Ghz-8GB-320GB-Win-7-Laptop-Webcam-/400767762429?hash=item5d4f9ebffd:g:UNgAAOSwR0JUO8js
http://www.ebay.co.uk/itm/WINDOWS-7-IBM-Lenovo-X220-FAST-Laptop-Core-i7-2-80Ghz-4Gb-Ram-1-Year-Warranty-/321923182321?hash=item4af41deef1:g:QyUAAOSwBLlU-YQx
Update to an SSD for a bit of a performance boost. It's not ultralight but it's better than most of the cheap laptops and it has a nice keyboard.
@aggi started
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I'd be tempted by a secondhand Lenovo X220
Maybe something along these lines
http://www.ebay.co.uk/itm/CHEAP-FAST-Lenovo-ThinkPad-X220-i5-2520-2-5Ghz-8GB-320GB-Win-7-Laptop-Webcam-/400767762429?hash=item5d4f9ebffd:g:UNgAAOSwR0JUO8js
http://www.ebay.co.uk/itm/WINDOWS-7-IBM-Lenovo-X220-FAST-Laptop-Core-i7-2-80Ghz-4Gb-Ram-1-Year-Warranty-/321923182321?hash=item4af41deef1:g:QyUAAOSwBLlU-YQx
Update to an SSD for a bit of a performance boost. It's not ultralight but it's better than most of the cheap laptops and it has a nice keyboard.