mine's a slightly upgraded prebuilt from 2009, i think it cost around $600 when we got it.

the only upgraded stuff is:
GTX460 (it was meant for my sister but wouldn't fit in her case so it's mine now)
2GB more RAM (started with only 2gb)
secondary 300gb hard drive taken from my mom's old dell dimension
i'm supposed to be getting a new computer this month though
edit: i have no idea why my stuff idles at such a high temperature. maybe it's because one of my front fans is practically broken and the side vents are right by my CRT.