I used the M3 3.0 setup as its easy to get parts, readily available anywhere.
my original clutch slave popped when using the bigger clutch, so i replaced it with the m3 slave and a braided hose. worked perfect, not heavy and very controllable
you can also get a lightened flywheel quite easy for the m3 setup as well. Release arm and bearing can be used from the m44 making it a dead easy modification (get a new bearing though while its all out)
I really didnt see the point of the m20 flywheel/m5 clutch option