First thing first... Everyone will have their opinions of this is better than this, etc etc...
I'm not to biased when it comes to PC components. I'm also not a "fan boy" either. I look at reviews and figure what is the best bang for the buck or what is el numero uno for the applications that I am running. I've looked into what you are looking for at Newegg.com and I tried to keep it conservative except where I believe that certain things need to be.
Let's begin:
GIGABYTE GA-EP35-DS3L LGA 775 Intel P35 ATX Intel Motherboard
(I chose this motherboard because 1. Its cheap, 2. Its stable, 3. Since you don't overclock there is no need for high end.)
Intel Core 2 Duo E8400
(one hell of a processor... You can go cheaper like w/ the E7200)
Corsair HX520 Modular Power Supply
(This is nice because you only have to hook up what cables you will actually need. No extra cables laying around)
G. Skill PC5300 DDR2667Mhz RAM
(I don't think you will be overclocking so this will match your processor just fine. No need to spend more for higher speed you won't use.)
Western Digital 500GB Hard Drive
(A nice, quiet, and cheap Hard Drive w/ a lot of space on it.)
Sapphire Radeon HD4750 Video Card
(These just came out are pretty much the best bang for your buck. If you are running Vista then ATI may be better for you.)
Samsung DVD Burner
(New DVD burner that burns at 22x speed. Fairly cheap too.)
I left out a case, keyboard, and mouse from this setup. The reason being is each person has their own tastes in what they want so I'll let you decide on that. This setup cost around $741 USD but can be made cheaper w/ a few swapping of parts. I hope this helps.
(Disclaimer: These are just suggestions and not what I say you should buy. Other people have other opinions.)
Edit: I noticed that some of these things do not come w/ the cables required to hook them up. (Hard drive, DVD drive, etc..) Those can be found at a local PC store at a reasonably inexpensive price.