#53 is going in a great direction. Perhaps some additional modification to give it motion, perhaps leaning toward the right but keeping the heart vertical.
68 looks great. I need a font change to something more space age looking. All Caps with the S and A being slighly larger than the rest of the letters as you already have them.
103 looks pretty good. would it possible to alter the left side of the heart and disconnect the left border so that it is not touching at the bottom point of the heart?