Green,
You have a very nice mix of coverstocks and options. I would think the Secret would be very close to the Double. There are some small differences like the Secret is a hybrid where the Double is pearl particle, but everything else is pretty close.
If you wanted to expand for a couple more different looks, you could get an Attitude Shift for a little more angular look on oil, a T-Road Solid for a smoother look on mediums, or a Sure Fire for a smoother look on medium/medium-dryer conditions.
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Mike Craig-Columbus, OH