I am wanting to make large scale, archival, museum quality art prints of my digital photographs. My thoughts are to make prints ranging from 3 feet square to 9 feet square. What is the largest size I can do and still maintain the quality desired? What are the pros and cons of the various printing methods such as digital c-print (if can do 9 feet square), ink jet, light jet and so on? And finally what sort of costs can I expect for the printing?