You should call customer service and ask their advice. Two very popular sites are newegg.com and tigerdirect.com - both will give you a good price on a kit. That means you put it together yourself, so you should have some experience using a screwdriver.
IMO memory is cheap enough that you might as well get 16GB or the max that the motherboard will hold. Solid State Drive, SSD, is almost the same price as a hard disk, so you really should get the more reliable SSD. I doubt that you will need a whole TB of drive space. I have put all my movies, CDs, and videos on my disk and still have not used up 1 TB. But if you have the bux, you will always be glad to have the space.
I have no information about the CPU. Ask another gamer about that.