just because of the fact that most people call them pictures these days... it brings the value down... you could still draw in a good mid- high xx.xx for both...even more to the right person
PhotographPrinter.com = low $xx, doesn't really sound right to me
PhotographPaper.com = mid $xx +, has a really catchy tone to it maybe you should develop it :P
HomePhotoPrinter.com = sound kinda weird.. reg fee - low $xx