As a finnish I would be careful with Teräväinen because his raise in the rankings has been huge and his performances has been great but I would personally rank him around 15-20 instead and I regard him as a high risk if Caps pick him.
In Finland Teuvo hasn´t had same kind of attention like Granlund (picked 9th, 13+27=40 points on draft year) or Armia (Picked 16th, 18+11=29 points on draft year) when Teräväinen has 11+7=18 points in this year.
SO
Mikael Granlund 40 points in 43 games = 0,93 ppg (2009-2010)
Joel Armia 29 points in 48 games = 0,60 ppg (2010-2011)
Teuvo Teräväinen 18 points in 40 games = 0,45 ppg (2011-2012)
These are stats from their regular season before "the draft summer" in SM-liiga
Only exception between these three Finnish young talents is that Teräväinen played also in Jokerit U20 team and few games in K-Vantaa in Mestis.
The stats above doesn´t tell everything and I have to defend Teräväinen because he hasn´t been a top 6 forward in his team like the other Finns I have compared him. He can become a great goal scorer if he gets more responsibility in next few years.
The point however is that he isn´t NHL-ready at least in 3 years or so and I think Caps needs young talent more quickly than that and his small size doesn´t convince me.
I hope a good career for Teuvo but somewhere else than in Washington.