With the exception of Jagga I feel exactly the same way, I spent some time watching Shanahan in the VFL and despite hitting the scoreboard none of his goals were cut from the cloth of a true power forward. He's crafty but you have to be exceptional to get by on this alone, Gunston is actually a rarity where this is concerned.
Armstrong looks pretty vanilla to me, maybe you get a player in that Amiss mould, that's still possible but I still prefer using a second rounder on Faull who stands every chance to be the better player. Jonty is more mobile but has inferior goal kicking, I think I would back myself to refine his kicking technique because you can't just instill a run and carry mindset into Armstrong, that simply won't happen.
I've already said enough on Smillie, at pick 10 I won't be too upset, at pick 6 ahead of Langford would be a mistake. Langford possesses elite kicking and is very strong overhead, there's options as a wingman, a mid or a medium forward. We have to play the percentages because Smillie is a midfield or bust proposition.