Believe it or not, it's their first release, the Opiate EP! I often tend to gravitate to a bands first album for whatever reason, be it Tool, Zep, Primus... there's just a certain raw energy there. Aenima is of course, way up there, (Forty Six & 2 is a beast!) as is Undertow. Around Lateralus, they start to become more hit or miss imo, sometimes getting to complex for their own good. Still loads of gems though, Parabola may be their best song of all.