To try to save space inside the case, I was looking for a way to utilize an external PSU. Can I just take the PSU out of the case listed and place it outside of the NES, or do I have to select a different mobo/cpu combo that has an onboard PSU? Any suggestions would be greatly appreciated.
I want to keep the inside of the case as cool as possible (I think I will be adding another fan to help with that) plus I don't want a hot PSU sitting inside the case. Also I want to keep enough room to fit both the HD and optical drive inside the case.
What you need is a picoPSU. They sell them over at mini-box.com. Basically, it gives you a 24-pin power supply that gets power from an external brick. You'll have to be low power though as they only go up to 150-160W.