ok, here you go:
current value - i could name thousands, but my favorite and also the hardest is probably "burn in"; also "melo" with panacea & "biohazard" with cooh
dj hidden - "the outsider looking in", also "onyo" (the whole "enclosed" album is pure gold, and he has many more great tracks)
machine code - whole "under the sun" album
the sect - "scan the cosmos" & "stranger"
limewax - "047 restored" & "jupiter"
the ones you maybe dont know already:
peter kurten - "kill me", also "favorite sin" with katharsys and TOA
hostage - "bamboo king"
triamer - "krasnodar", also "dead souls" with contrage
enduser - "1/3"
mystification - "show me how to cry" (not the hardest, but probably one of the best tracks ever)
greyone - "ghost possession"
tamas - "sadist", also "neutronome" with pylon & walder
kriotek - "telepat"
nagato - "1207"
oiltech - "dark soldiers"
angerfist - "temple of disease" (yes, angerfist makes dnb, and its good)