My advice would be to buy a single laptop. This will safe you money and will take the hassle out of synching the files between the office pc and the laptop. Hp are good for printers so thats a good choice.
By the way are you just printing text documents or colour images?
As for dell they charge a little bit too much for a basic laptop so consider another supplier such as cclonline. They have a wide range of laptops which aren't too pricey and they have good technical support. You could also try aria.co.uk