What Michael says and I'd add that I have seen much better,much more consistant results with those printingfrom a RIP ... either QTR or IJC (black aand white only RIP's) or Image Print, Colorburst and others. My preference, when I was using an Epson, was Colorburst because it is full Postscript, takes full control of the printer totally bypassing the Epson drivers (which Image Print doesn't), is SWOP certified, etc.
Now, note I said when I used ... I only have one Epson in the shop these day (an old beater R800 the spews out notecards when there is a crunch). I was one of the unlucky minority that had to deal with a major nozzle clog twice and swore never again after spendin near 400 on ink to fux the second one. I am now running a Canon iPF 5000 and an HP B9180 with a z3100 coming soon. Both the Canon and the HO outperform the coperable Epson machines IMO and both do so, for the moment at least, at a lower purchase and operating cost.