I bought a Canon i860 color printer and am really thrilled with the 8.5" x 11" prints on matt photo paper. I just returned from a sci-fi mini-convention here at home and actually won a prize for one of my pictures (yay!).

Here's the settings I use for my renders (minus the anti-alias). At 72pixels/inch, the print size is roughly 54". Once in Paint Shop Pro I change the resolution to 200dpixels/inch, which brings the actual printed size down to something like 16" wide. And from there I either use the "fit to page" option of the printer, or force it to the correct size. For anything 11" x 17" or smaller, these settings work fine as long as you have good paper and a good printer. But anything larger than that will require a higher overall pixel/inch setting from the beginning.