Just another thought, where are the prints going to be shown? Gallery walls are generally very white, walls in peoples homes come in a variety of colors, corporate is a mixed bag, and you are in control of your portfolio. Might be good to matt a print in several variations of white to grey, and try them out. Hang them in your house, lend them to a friend, enter them into shows, etc. I was just lucky enough to see 2 of my pieces side by side in a gallery show, and simple matt and frame worked much better than I thought (your work looks different when you get it out of your working space). As others have noted, styles and tastes change. And also, viewing a website is a different visual experience than viewing something in person.