Printing size/resolution

Guys, im about to go see the photo shop about printing a photo to hang on the wall, but i cant decide what size to print it in, i really think the bigger the better without loosing to much detail. it's a 3144 by 4630 pixels framed image from my D200.
So i guess all im after is some opinions on how big you would go?
Cheers
Adam

So i guess all im after is some opinions on how big you would go?
Cheers
Adam