Sadly, I'm not the perfect CV fan...I had to look a few of these up to remember for sure which they were. The pause/noise in Rondo's Vampire Killer is annoying, but I like the rest of the song.
But my first thought was definitely Harmony of Dissonance in general. I kinda like the songs in that, the melodies and harmonies of many of the songs sound great...and (to fit with the title) there is an odd harmony in the dissonance of some of the melodies/harmonies. But the quality of the sound is terrible. >.< I remember being excited to hear the new music on HoD when I picked it up, and still remember my initial thoughts. The title screen sounded fine, and then the name screen music started and I thought, "What the crap?! That sounds awful! Why'd they make it worse?! CotM sounded great! Maybe it'll get better." But it didn't. I played through the game, liking the music worse and worse until the credits, where I thought, "This is awesome! Why didn't they make the whole game this way?!?!"
When I bought the CotM soundtrack later, I gave the music another chance, and while I still hate the sound, I can enjoy some of the harmony as I mentioned.
And "I am the Wind"...UGH! I'd forgotten about that one. I remember somehow having the idea that the credits music is always the best, until I heard this song. When the lyrics started, I distinctly remember shouting, "Oh my God!" and muting the TV.
So that's my vote...HoD and I am the Wind.