I have no issue trading the 1st for Hertl. I forgot he was a UFA at seasons end. He's the type of high-impact LW/C we could really use in the top-6, 2PP that would be worth our 1st+.
No chance I'd add Amirov (or Niemela, Robby, Knies) in a deal for a rental though. Just seems insane to be giving that level of value on guys that appear to have "hit". Plus no teams give a 1st + A prospect for a rental. I'd do one of our B-tier guys though: Hirvonen, Abruzzese, Holmberg, Abramov, Kokkonen, etc. and just be sad about it being slightly too much.