Most impressive Kalmah songs.

Swamplord: Every song is actually amazing. But Hades and Alteration.. AAH!

Black Waltz: THe Black Waltz, hell yeah this song is great!

12 Gauge: One Of Fail, Bullets Are Blind, great songs =)
 
Well, Moon of My Nights got me into Kalmah, and into melodic death metal. I heard the song on a Youtube video for the game Crysis and was hooked.

I would also pick Outremer because it kicks ass.