Who gives a crap what the most expensive record on discogs is. I'd actually rather it not be an acid tune, as I always loved the whole scene's rejection of materialism. Leave that shit to the house scene. When I saw HAVE27 listed for 50k, my first thought was "what a wanker", followed quickly by "meh".
Sorry to get the thread back on track, but my favourite Havoks, in no particular order, would probably be Lab 4 - Machine, both sides of HAVE13 and Fahrenheit & Delbruck - Reanimate.