Yeah buy the following parts:
1 - Buy a nice new case and power supply - this will first off make your computer look much nicer!
2 - Buy a new motherboard, processor, RAM. Make sure you have some onboard VGA graphics, and a PCIexpress 2.0 x16 slot on the motherboard.
3 - Buy a nice modern graphics card
4 - Sit back and marvel at your nice new shiny modern self-built PC!
5 - Take all of your old parts and try to sell them or just have a party and destroy them all in a sacraficial manner