This my first large print from my Nikon D40. It's 20"x30," ordered from Mpix. I ordered it mounted on double weight mount board. The print quality is A+. Even up close the quality of the image looks great.
I bought the metal frame at Hobby Lobby (the kind that sides comes in different lengths so you can make whatever size you need). They cut the glass & another backer board. I was out of there quick and inexpensive in a matter of minutes.
I took the picture by my back steps and input the text using Photoscape, a great FREE image editing program. Get the Faststone add-on program to add text, batch, watermark etc.
There will definitely be more large prints in my future.