For your starting items its pretty basic, Tango (Might need some help regen), Quelling Blade (Better last hits for Blood Bath) and Stout Shield (Harassing BS is nice)
For Early game its also very simple, Power Treads and Poor Man's Shield. Power Treads can be set on Agility or Strength, depending on the situation or just personal opinion. Poor Man's Shield is just upgraded by Stout Sheild.
Mid Game ALWAYS AND I MEAN ALWAYS GET SANGE AND YASHA. Lets see why is it so awesome, increase strength (Good for damage), increase agility (Faster attack speed), increase intelligence (Mana is not a big problem for you). Here is where it gets serious, INCREASE ATTACK SPEED EFFING YES! INCREASE MOVEMENT SPEED WITH THRIST HE AIN'T SURVIVING.
Late Game/Situational well Divine if you are godlike, Dagon is good with your Rupture, Radiance only if you are godlike, Assault can is very good for BS, BKB if you are dieying alot.