I am no expert but I would say this much. Build for a 64 bit system not 32 bit. 32 bit is old hat for Cubase and has limits that you wont like. Get a decent motherboard from say Asus or Gigabyte. Use a core 17 processor the run great with Cubase, get the fastest you can afford. Then put as much RAM as you can in the system. Obviously a good soundcard/device
Tom’s hardware is another place to give you up to date tech info and they have a forum.