Probably not the PSU. Darn. My budget doesn't really support replacing any other component.
The CPU gets up to around 187°F and then cools to around 167°F and holds steady around there.
The GPU never gets hotter than 111°F and idles around 90°-99°F.
BTW, I doubt that it matters, but I thought I should add that it has two fans that idle at about 2200RPM and 4400RPM, and when the CPU heats up, they go up to about 3400RPM and 5500-6000RPM respectively.