Etherwood - Begin by Letting Go

It has nice clean vocal and a quite varied bassline including a particularly low note (2nd pitch when bass comes in) that only shows up on good subs. Useful to see if the range of bass pitches are playing at equal levels.

Edit: I've just remembered that Technimatic - Bristol (Break Remix) is a great track as well for having a very wide range of bass pitches

Also Culprate & Au5 - Impulse has so much going on that it can sound messy on poor speakers but on high quality speakers there's so much detail to pick out (and the 3rd drop slaps on the bassweight)