How large is large and what is your budget? Do you inted to print B&W or just color?
For a low budget printer that is great for color prints, prints 13" wide, and will print decent toned monochromes (but is not so hot with true B&W, I use a Epson R1900. It's replacement, the R2000 may be better with B&W.
If you want something a little bigger, and can afford it, teh Epson 3880 is a great. Excellent color, excellent monochrome, excellent on all surfaces. 17" wide, but does not take roll stock. (You can print up to 37.5" long though).
Tell us what you need and Ernesto will give you the best answer.