Originally Posted by Ahhhh ****
it really depends on not just the items, but the characters. Zeals are nice, but two zeals are more expensive and provide less move speed bonus than a single phantom dancer- however in other ways the two zeals might be better, it depends on the needs.
This is actually false. The second zeal is 455 cheaper than the PD upgrade and gives 1% extra MS, which is why people stack zeals in the first place. The PD gives more offensive stats.
It depends on whether you're building for stats or effects. Glacial gives most of the cdr of FH, you finish it when you want the armour and aura. Giant's belt gives most of the HP of mallet and Phage gives most of the AD, don't combine it until you want the effect.