Most of the effort in pushing down the clutch pedal is wasted on overcoming the friction in the cable, that's why when you fit a new cable it's wonderfully light, then as teflon liner inside starts to wear and get snagged between inner and outer cable it gets sticky and rough.
HYdraulic defo the way to go, but as regards how much power, mine is std, on 380 odd with no problems.
tabetha