Helenius or Lindstrom, even at 2nd OV for me, Demidov has had 2 serious knee injuries this year and his play style is injury prone, he skates through sticks and players, thats spectacular, but risky. He also needs to get stronger and the top speed is average for an average sized player.
Silayev is my top ranked D on a tier of his own, but we need offense, so he would be my 3rd option. I like Iginla, but I have him a tier below Helenius and Lindstrom since I think his upside is more limited.
He will likely look like a genius in 3 yrs from now, terribly underrated on HF.