We were just trying to say it's always good to have a quality PSU. Sometimes it's hard to say what is a quality PSU. Remember that even a quality PSU can be faulty.
We are recommending the FSP (fortron) cos they are cheap compared to others and are really good quality.
I dont see your comp consuming more than 150W at worst but I think the number would be closer to a 100-120W.
Meaning you dont need more than 15A on the 12V rail on the PSU.
15A*12V = 180W.
I have a comp like that powered by a 200W PSU with 13A on the 12V rail.
These FSP (350W, 400W) have something like 2x18A on the 12V. Thats 36A and counting in that it probably can deliver 80% of that continuosly... that's 36*0.8 = 28.8A more than you will ever need. I hope you get the picture.