When I went to purchase a computer for our Non-Profit Dell told me they have two types (in the area I was buying). One is for home use and one is more for business. They look the same but: The home use one has a box of plastic with a non-tested motherboard and the business is built around a mental shell with a well tested motherboard.
We spent the extra $125 and have had the unit working well for the past three weeks.
I'll let you know if it fails, what failed and how it was handled by both Dell and our tech.