I like
#25 and
#22 with the hourglass. The S just looks too rigid, not fun and happy enough, but the concept seems like a good one, the colors are good, the font on the non-S letters looks good, but the hour glass itself is not pretty enough or fun enough or something. If I knew what the magic might be to get it all to look great, I would clue you in more, but if you are game to play around with it more, you might be able to get an hourglass S that fits the bill. Thanks!