Yeah, I'd give up the Recon Dalek for either the 2013 or 2020 Cyberman, OR a New Series Ice Warrior or Zygon.
My reasoning being that Dalek was a one-off, and less a proper Dalek than a compromise of an existing model, a la Dalek Caan. Meanwhile, others don't even have typical representation. It's the only 100% new figure we've gotten in some time, and....yeah. Easy trade.
Also, while I am completely happy with what we've gotten lately, and consequently won't pick on those beyond that Dalek:
I'd trade Sharaz Jek for a proper Ainley Master.
I'd trade Tux 10 for a tieless, open collar 10 with a redo of his coat to be less bulky.
(Having my cake and eating it too with those, hehe.

)