I notice you haven't received any replies, so I will respond the best I can.
I am not into gaming, but two forum members who use to answer these types of question is no longer posting. The only advice I can offer, is to check for compatibility the parts you have selected, with one of the main retailers. If things do not turn out right, then you might have some redress on the retailer.
The retailer or retailer's might even supply the items as a bundle or barebones with a discount?.
Hopefully, someone more knowledgeable might see that I have bump this up the list, and provide better advice and help.