HP laserjets are quite popular with business customers in work. If you're still looking at inkjets, though all of my customers have been really happy with the HP 5515. It has a duplexer in it as well as airprint :) The apps you can get for the more advanced HPs are really cool.
If you get it from currys/PC World at the minute you get your first inks free, too. So as well as the starter inks in the box you get a second ink, too.