Knowing Lexmark the toner is probably hideously expensive and the cartridge that comes with the printer will hold enough for about 100 pages, but it may be worth a look if you need a network printer for low-volume work.
later it's an E120N and seems to have fairly positive reviews; network ready, 600DPI, 19ppm, refurbished toner cartridge (2000 pages) £31 + VAT, new cartridge (2000 pages) £42.45.
Full specification here:
http://www.oyyy.co.uk/product.php?xProd=25281&xSec=#specification
But I'm not very impressed by the toner cost, 2p plus per page.