My question is: Will the PSU I've selected be okay for my needs? (details described below)
I'm trying to create a quiet system to be used in a 27 square meter (290 square feet) apartment that I share with my girlfriend. Emphasis: The system must be quiet; we live in one small room. Also, I'm trying to keep the cost low.
My assumption is that if I have a low wattage system with a case with good airflow and large fans (140mm-200mm), then the machine will be very quiet.
Your system is going to draw less than 200 watts at full load . A 430 watt unit will not be challenged .
In a case like the HAF you can disconnect all the fans in a build like this . It will cool well enough since heat will just rise out the top of the case .
I'd be tempted to use a quiet case . Or a home theater case like the silverstone GD 05 . Slow the fans a little and it will be silent too , and probably be less intrusive in a small space .
Your ram needs to be 1600 Mhz or 1866 Mhz to get the best graphics performance from the A6-3500