Hm...thinking of building glacial shroud, making my build:

Ring+Boot
Sorc
Rylai's
Shroud
Cap/Staff

1500g is a significant investment for that last bit of CDR, but I think the armor will be a great addition.

Don't forget Hextech Sweeper as well. With health, CDR, and AP, it's a good item no matter what, but in a game that has Wukong, Shaco, Eve, Twitch, or Talon it's a very good item.

I build Glacial Shroud on my casters. There is always one or more problematic AD champions on the enemy team. It caps out the CDR, or close to, with masteries/runes and one cheap item. The mana in conjunction with the CDR is perfect for more spamming.

Passing up the cheap penetration on Sorc Shoes is not worth it, in my opinion.

Oh, and Sweeper too. That item is incredibly powerful.

+1 for the sweeper. Wukong doesn't seem so tough after someone has it.