@TS,
If you are really dead serious about trimming down the consumption,
your biggest move would be to buy a gold rated psu. Seasonic offers one of the bests.
Second, get an ssd or a green HD.
Third, get a case with a decent airflow design so you can get rid of redundant fans.
Get a GSkill Sniper 1.25v or any LV memory. Not too significant but still cuts the watts.
If you are not planning to overclock or house a lot of devices on your board, get that which offers only the basic interfaces/expansion you will only need.