The 600T is also an excellent case, but is a Mid Tower, the phantom is a full tower. It really depends of your hardware, if you want to do watercooling, SLI or Crossfire, the phantom is great.
I'll go with the 600T (If you have a single GPU, an ATX Motherboard and a couple of HDD).
Quick question, where are you buying those cases? In newegg the Phantom Full tower is at $100 http://www.newegg.com/Product/Product.aspx?Item=N82E16811146067.
The Phantom for $160 is too much. If you only have to choose from the Phantom at $160 and the 600T for $130, I'll say go for the 600T. Both cases are quality ones, but it's your choice.