Roy, my opinion is that it is entirely up to you how many variations of effects you want to include in your gallery, but keep in mind that the thumbnails of those types of images usually don't look all that different from the photos themselves, and having several very similar images one right after the other can dilute the impact of the image in the buyer's eye. I think it's a better idea to choose the one you think looks the best and go with that one, though I have done it both ways when I absolutely can't decide.
BTW, welcome to FAA!