Jari M. for sure. That dude is just really good at writing music. Less so at, you know, putting it out in a timely fashion (lawls) but yea, I've always been very inspired by them, Ensiferum, Kalmah, Insomnium.
Outside of metal, I'm really into La Roux, Beirut, Metric, Devotchka, and Rattatat