I just finished printing a shot from my D1 on an Epson 1270 on "Super B" paper (13" x 19", so the printed area is a little smaller). I was really pleased with the results. If you look very closely, it's a little soft, but from a normal viewing distance it looks great.
I used QImage Pro, which is found at http://www.ddisoftware.com/qimage/ . QImage will get the most out of your printer, and it only costs $35. There is a trial version you can download. ( I have no association with the creator of QImage. I'm just a happy user).
I also think it's important to sharpen the file properly before printing. I used Nik Sharpener Home Edition, which can be found at: http://www.nikmultimedia.com/usa/products/sharpenerpro/home/home.shtml At $79 I'm not sure it's worth the money. It works, but I think one could do the same with Photoshop, but you'd have to spend more time working on it to get good results.