All the Decred you can afford.
Really? How high do you reckon Decred can go? And do you think Ark and Iconomi are good investments?
1. All the Decred you can afford.
2. When it rollsover immediately trade to all the UNO u can hoarde.
3. Then day trade your UN-DecREd stash direct A for B, visa versa

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$UNO the long term players base pair of choice
http://coinmarketcap.com/currencies/unobtanium/#charts