only make sure to take the CD between 0:00  and 1:00  UTC, so you don't lose a bit of the proportional daily interest  (unless TradeFortress has changed that).

And having above 1 BTC sitting in there, is good.

Even if in long term is easier take only CDs, and renew them as soon as possible to earn as much possible compound interest as possible... having a BTC or 2 sitting in there, earning daily mili-bitcoins, is really nice as well