I have been asked to exhibit about six large (20" X 30") prints for an upcoming art show. I don't have any large print experience and would really appreciate some advice on the best way to post process the original RAW files to reach this size. Most were shot using the D1X. I've read about several methods, including incremental up-resing, one-shot up-resing, use of programs such as Genuine Fractals, etc., but what do you guys recommend? Your help would be really appreciated as I have to get off my duff and get this done!