Its for a small magazine business. So colour quality is important, running costs are an issue but not at the expense of quality. Being networkable is a plus and duplexing is a bonus but all secondary to quality and secondly cost.
I am leaning towards the Xerox/Dell. Xerox seems to have the best colour print quality(but higher running costs) and the Dell seems good all round with low running costs but Duplexing is extra.