Your PSU is from OCZ wich is a reliable and good manufactur, also 700W is enough for two of your GPU's, so there is no problem there.
(Also pirating software is ilegal and this forum does not suport such things, so lets forget you said that)
As long as you get a 64bit OS to fully use your ram, any version is fine either home or ultimate.
Everything seems fine and should run like a beast.
Have fun assembling.