I DEAL MOSTLY WITH GAMING PC'S. IN THIS DESCRIPTION I AM TALKING MAINLY ABOUT PERFORMANCE FOR GAMING
Ask me about builds and you shall receive answers. If you recommend me a build and i knew it was recommended because its crap i wont respond. Go to the forum section for that.
RAM I generally dont recommend 16GB system memory (RAM) for gaming. Especially in budget systems. 8gb is usually fine for 1080p gaming. If upgrading ram is a thought for the future a single 8gb stick will do fine until the need for 8 more gigs is wanted/needed
Power Supplies: Dont ever skimp on a PSU. It is arguably the most important part in a system as if it is bad quality it can take other parts with it when it dies. My "general" rule of thumb right now for PSUs is to spend $0.10 per watt on the unit before discounts and mail in rebates. I follow this to ensure getting high quality components in the power supply to safeguard the system from damages caused by a bad PSU.
AMD vs. Intel: I generally dont ever recommend AMD processors for gaming. I mostly deal with CPUs in the $100-$250 range and there is not really any argument AMD can make here. Any FX is beat out by a locked i5 and FX processors between $80 and $130 are beat out by a dual core i3.