I voted for #1 and here's why:
1. I like simpler graphics, that's just my preference.
2. With simpler graphics (2 colors, less detail, etc) it is much easier to transfer to different media. It may look great on a computer, but how does it look on a window, flyers, t-shirts, etc? How does it look in black and white? Although I'm not a graphic designer, I never liked messing around with gradients on graphics. It never came out the way I liked it when printed.
3. Two colored graphic would give you a basic color theme for your business, and an extra option that just one color.
I also liked #6, but maybe change the arrows and the "o" to the green color.
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