Swap the:
Motherboard to a DS3L or P5K
CPU to E2180 and OC to 3Ghz
RAM to DDR2 800
Add a Zalman CPNS 7x00 cooler or Arctic Freezer 7
PSU to a Corsair 450VX or smiler high quality PSU. See:
http://www.xtremesystems.org/forum [...] p?t=108088 for PSU tier listing. Get one from the top tires there.