Laser is great as long as you don't get one of the really cheap crappy ones with tiny toner cartridges. The manufacturers have caught on to the "lasers are cheaper" perception so the bottom of the range can be nearly as expensive to run as most inkjets.
Brother aren't bad for cheaper lasers, although most want a new drum at 20k pages which can be more than the printer's worth. They will go on for a while beyond that though without replacing. Else look out for a lightly-used HP from their business-focussed range (2400 series, etc), which can be had for about £70 delivered on ebay, take cheap official toner or really cheap 3rd party ones and will go on and on.
Else if you need colour and print a lot, look at an Epson which can take a CISS (continuous ink) system – you then just buy the ink by the bottle and the cost per page is next to nothing.