To make it a bit clearer:
I will buy cooler master cosmos 2 case,
I7 3820 CPU and
Asus Rampage IV extreme
Stick them together,
Then take the 460 gfx / two WD HD / Memory/ CPU Cooler from old pc and stick them in
will it all work okay?
Then as weeks go by i can slowly buy the other 'new parts to replace the old one