Every DMD below 50k satoshi is super-cheap in my opinion,
if I would like to increase my DMD stash, I'd buy every DMD below 50k sat.
I am confident we will see 75k soon enough, and in 2019 it could be very hard to get 1 DMD below 100k satoshi.
Frankly, I think you are being a bit cautious with your predictions.
I reckon DMD will see 75k+ sats in quarter three of 2018, and exceed 100k sats by Christmas.
As for 2019, don't be surprised if DMD hits 500,000 sats.