A lot is down to preference...I disagree with the SOAD(Toxicity!), NIRVANA(Bleach!) and Slipknot(S/T + VOL.3) suggestions The first one Thought of is Tool, but im not sure if I like Lateralus more than Aenima! Nile have improved from Album to Album....Metallica up to justice, then it got shit! Pantera up to Reinventing The Steel...Deftones, although I can understand why someone would prefer the energy on the first two albums. Qeens of the stone age, Meshuggah? I normally prefer band's earlier stuff, it has just become an assumption now for me checking out bands that the earlier stuff will be better!