I have a seasonic s12 500 and the cables were definitely too short for my Temjin tj06 case. Granted the TJ6 is larger than the p180, but the layouts are similar in that the powersupply is positioned differently from a standard atx case. I ended up getting a 24 to 24 pin extension and has to run a 4 pin extension from another molex instead of the dedicated 4pin because it was too short. Dont get me wrong though...the seasonic has been practically silent and works great.
try to find out how long the coolergiant cables are, if extensions are something you dont want to deal with.