did you search the forum or google?
this is not int he newbie section so i am allowed to say the above comment!
here are some tips: (and i can't beleive i am doing this)
Sproggy Mk4.5 - 250W DIY PSU. cost approx £100 in kit form
Keypower - standard ATX style so no advanced startup/shutdown - i think
You sure the 150W won't do? You could always use something else to run additional devices.