No my friend, that is not the way to do it.

Start with your performance requirements and what you can afford and build a balanced system around that.

DO NOT build a box around a peripheral, which is what a video card is. Also remember that a lot of this stuff has actually advanced beyond the capability of current software to use it.

RAM is the most flexible, component because it is easily added and you do not have to buy it all at once.

I would start with the processor/motherboard combination that you want, then the best RAM to support them. Then look at your video card.