i would say:
peter brötsmann - machine gun
derek bailey - solo guitar
anthrony braxton - for alto
these three are close to being noise, actually. i also like ornette colemans "the shape of jazz to come", but while it's dissonant, it's not as wild as the three mentioned above. there is also a danish guy still working called jørgen teller, apparently trying to combine stooges-like punk rock guitar and free jazz