Buy Figure Number Five and Natural Born Chaos if you can. The songs you mentioned were good, but two of those were from another album and "Song of the Damned" is most certainly not the best song on Chaos.

If you can download mp3s, find the following songs. I'll also list which album they're off of:

Distortion Sleep (Figure Number Five)
Rejection Role (Figure Number Five)
Departure Plan )Figure Number Five)

As We Speak (Natural Born Chaos)
Black Star Deciever (Natural Born Chaos)
Follow The Hollow (Natural Born Chaos)

If those songs don't make you run out and buy those CDs immediately then I will be genuinely shocked. I would start with Figure Number Five and Natural Born Chaos if you can afford it as well. After that, you might want to consider picking up A Predator's Portrait.