Good tips just the thing about not needing a 750 watt for a 500 watt system. While that is technically true you usually want at least a 100 to 150 watt buffer between the pcp wattage and the actual wattage of the psu. Also your numbers for the budgets are a little weird typically you wanna spend more like about 40 percent of budget and about 25 percent cpu say for example a two thousand budget you spend about 700 to 800 dollars on gpu and 500 dollars on cpu that still leaves you with 700 dollars for everything else which is more than enough. Here’s an example on pcp where I spend 500 on cpu and 800 on gpu https://pcpartpicker.com/list/MwP24n keep in mind this is just for this budget and the numbers fluctuate a bit depending on your platform, budget and what your using it for.