My last workplace we bought 5 Acer laptops... 4 out of 5 the lcd screens failed, and Acer would not replace them ... left a bad taste.
Dell, I had an inspiron 9300 for a year or so.. Harddrive died in it, called Dell, said the harddrive was dead, no questions sent me a new one
.. Not sure what they're like now.
Asus, pretty slick machines. I find some of their models they use very abnormal keyboard layours, and that really irks me when the layouts get changed.
But for business, I found Acer is still the most bang for your buck company.