Whatever you do, stay the hell away from Rigs Unlimited in Allenstown. They seriously screwed up the lift on a friend's XJ, took way longer than they said, and overcharged him.
Tim's Speed in Nashua, NH 603-883-2700
Domenic's Auto and Jeep in Hampstead, NH 603-329-9439 http://www.domenicsautoandjeep.com/
Gunseth's 4x4 in Swanzey, NH 603-352-4204 (they're probably too far a drive for you, but they do specialize in Jeeps. http://www.gunseths4x4.com/door/
HTH
Tim's Speed in Nashua, NH 603-883-2700
Domenic's Auto and Jeep in Hampstead, NH 603-329-9439 http://www.domenicsautoandjeep.com/
Gunseth's 4x4 in Swanzey, NH 603-352-4204 (they're probably too far a drive for you, but they do specialize in Jeeps. http://www.gunseths4x4.com/door/
HTH