DrumWorks is pretty cool, has some deeper sounds on there.

Ive allways liked Compound(mainly cause of the Headroom stuff on there)

Audio assault and Arms are realy the Daddys of hard techno for me over the past year or so,
as Dustin said they are covering the range of the hard sound....plus they have nice covers.

Patterns I like as again it has covers a range of the harder sound.

Betamax has been realy good, Quite fresh as has Mastertraxx and hardsignal.

Form were deadly.