while checking out Manga Studio products recommended by D.L. Maffet I discovered this great link to do perspective in photoshop for digital artists. http://www.freddieart.com/quicktools/index.php?page=detail&get_id=1&category=2 -It's free and easy to learn.
I'm going to try the free trial of Manga Studio 4 once I get a tablet. Been contemplating about going completely digital in a year after some good advice from D.L.