Just remember Lennu that when we get to sieges in Strategus, anything that is pure 2h/polearm without a decent shield skill is going to be frustrating when you get pew pewed over and over and over again, not that shields + skill make you invincible, but you know what I'm saying. If you can deal with that then I say go for it. The first couple of builds look nicest to me.
The xbow build is like my xbow alts ( except he is level 30 ) and I just use a Mace ( 2h one ) Arbalest and a quiver of steel bolts, works really nice.