You need to think about what class does best.
Obviously the dwarf needs to do damage SO...
The best thing to do when you progress further is get him the biggest
whooparse axe you can find and hack and hack and hack till they fall to
bits or the dwarf collapses from over-exertion with a silly grin on his
face.
It might be my personal opinion but honestly, don't get yourself worked
up over getting Clangeddin's Strike or whatever its called, because it
just hinders you. It needs a hammer to use and the hammer is so much
slower in attack than an axe you'd wonder why they put it in in the
first place. Trust me, whirlwind and bullrush are the way to go.

Likewise the sorceress needs a way to protect herself when it comes down
to the dirty work.
Regardless of what people might say, she just can't hack it with a shiny
dagger and a cone of cold spell. Not to say she needs to get up close
but you need to realize that there will be plenty of times when she has
to disembowel the attackers. As soon as you can get her a decent sword,
a decent shield and maybe even a bow. Oh, and put as many points as you
can spare into mordenkainen's sword because the little bloke will go far
let me tell you.