I agree with you,Frenchy Pilou
I'm approaching to z-brush:i have bought Scott Spencer's book :Advanced digital sculpting(Italian title)
first i tried sculptris,i tried to do a simple carrot....disasters! (i'm nurbs addicted like MajikMike)
this is because sculptris don't offer so many tools like his big brother(z-spheres..masks..etc.)
i think that if you want to do human detailed models you have to be a real sculptor,or,at least, have something in you..a natural approach to real clay sculpture...
so i say to myself:Mauro you cannot do everythig you want...but i'm following z-brush,i plan to use it in the future