These are my system specs...........
This is my version of a budget system,
simple all-purpose rig that does what it's told,
No overclocking, 3DMark06-8771
Boot time to loaded desk-top in 1.23 minutes
Case: Thermaltake full-tower http://www.newegg.com/Product/Product.aspx?Item=N82E16811133032
I set mine up with a pair of 120mm fans in the front,
the chimney vent has a 120mm fan, another 120mm fan on the back wall,
above that is a 90mm fan drawing air thru the removeable HDD cage.
CPU: AMD Athlon 64 X2 5200+ 2.6GHz http://www.newegg.com/Product/Product.aspx?Item=N82E16819103759
I've always had good-luck with AMD, there are better choices but it works just fine for me,
waiting on K10 prices before upgrading to the 6400+ 3.2GHz version.