I am 14 years old and I do know a lot about computers i'm getting an obsidian 900d case and idk what parts to get or if I could even build one can someone help me out I want it to stay under $1,300 and I want it to be the best it can. (I want at least 8GB of ram). I am also looking for the cpu to be separate from the motherboard so I can upgrade the cpu later if I need/want to. If you have any other case recommendation I would be up to here it thanks!