It changes all the time but off the top of my head, right now, something like:

Glenn Wilson - always brilliantly produced, hard, dark & intelligent all at the same time
Tim Wright - nobody else sounds like him... genuine funk
Alex Calver - brings creativity & polish to the hard stuff
Julian Liberator - too often overlooked IMO, can mangle sound in the most beautifully awful ways
Dirty Bass - mainly because I'm currently listening to that Voidloss PA for the 3rd time today & it's grabbed me like nothing has in a good while!