No need of installing OS on new HDD, until unless u wants to make new HDD as primary. Only thing is you need to do format the HDD, if require make it few partition.
rig looks good. Few suggestions look for asus Z68 or P67 mobo (depends on ur requirement whether really required cf/sli) and GPU 560ti
75 is bit high. In general CPU temp would be 35~40, where as in full load it may reach 50. Better clean CPU fan and apply some good thermal paste.
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