I think you lack the confidence needed to undertake building a hight tech PC like your talking about. If anyone here on loine is going to help you, they will need the operating parameters of what you want and what you want to use it for. Whats the name brand and model of what you are using now and has it been upgraded and if so what are the upgrades. If your plans are to use a 98 year PC for an upgrade base you havent got much to salvage. Are you interested in INtel or AMD CPU's. Both are good but in the next two years there will probaly be many major changes. If you are serious, have the money and a supportative parent I recommend you find a nearby PC club together with your parents have a couple three meetings with some one with building smarts. If you aren't very careful you'll wind up woth and expensive box of junk. Have you got a good source of supply that stands behind there products and supptort peaple that aren't just after you money. I'm 77 and building a PC with a AMD ATHLON 64X2 3800+ on a non-sli mother board. Everything went well until I bent two pins On the CPU ( $325) . Waiting now to see if AMD will help me with warranty. I've been in electronics for over 50 years ( retired in 88) and still I get very nervous putting stuff together. If you decide to do tbis, read everything three times , put it aside for a few days and then read it a couple times more. If you have doubts get help and not from some like yourself. Good luck.
P.S. I had a lot of help frm my 13 year old grandson, his nerves and eyes are much better than mine. He fiddles with remote control cars ( gas and electric) for a hobby and is slowly getting into the PC bussiness as learns and understands more about how they work. When you can pull the side off a PC and in your mind see what the various sub asseblies are doing you are on your way. Again Good Luck.
