The Epson photo printers print in large swaths, much wider than normal printers. Their quality is much higher. And I've seen the latest one has 4 separate ink cartiges (C M Y K) so you can change only the dead colour and not the entire cartrigde.
If you print documents, or photos for your personal interest, I'd go with a Stylus (I've got a 777i). If you really need the resolution, go for the bigger, and more expensive photo printer.