I haven't built a system from scratch in almost 10 years. I last updated my system in maybe 2005-2006, I can't even remember. My current rig is a Pentium 4 3.0ghz, 1gb RAM, GeForce 6600GT in an ancient case. I don't even turn it on anymore, I usually use my laptop purchased in August 2008.
With Starcraft 2 and Civilization 5 on the horizon, I want an upgrade. I also play L4D2. I will buy a monitor at a later date but currently I output to a 32" Sony 1080p Bravia. I have a legacy 17" LCD Samsung flat panel (4:3 AR... ) that I may use as well.
The other main use for my computer is HD playback (TV / movies).
I would like to shave the price down a bit if possible.
Here is what I came up with: (Micro Center prices, a store is very close to me).