Now at $1.50. I can see this going under a dollar in the next few days/weeks. In a year to 18 months we should be around a cent per coin. Finally in about 2 years from now, we will see another run up probably to in excess of $300.
So the trick is to just wait it out and buy when price looks super frightening and hopeless. When bitcoin has a 2 on the front of the usd price, time to consider buying your Nano. This is all a cycle with bitcoin halving at the center. We are 660 days from the next halving.