I've tried everything at one time or another, but I seem to have the most success with the coins. They are like 36 for $5. I just soak them with tap water and put them in a cheap dollar store mini greenhouse on top of my stereo.
At one time or another I tried it all. Scuffing the seed with sandpaper, putting in a bag of moist soil taped to your window, soaking in water for 24-48 hrs them planting, putting between paper towels in a baggie, straight up planting, H30, rockwool, etc.
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I like the coins. Perfect moisture everytime.