Yes! Build a brand new computer to your specs. Keep the HP as a 2nd. computer, or sell/donate it.
Yes, use this computer for as long as you can stand it once Sandy Bridge/Bulldozer come out and then make a new build based on one of those platforms.
Should I trade this PC for a HP tablet laptop + 350 cash? Thats what the guy is offering. He says its 8/10 condition and does not overheat. Should I do it? I'm going to uni so I won't really... be gaming? What do you guys think I should do ?