I never really put mana on Urgot...
So my Urgot builds, when I actually play him, have always focused on AD, CDR, and Armor Pen.
I ration mana and nuke with my spell when I geta chance. Also Essence Reaver is nice on Urgot and alleviates some early mana problems if rushed.
....they nerfed my Urgot's shield...
that shield is so fuckin good now
u can probably figure out a better build than me i had like 13% wasted cdr almost