K, cool
So I'm probably getting this stuff: http://pcpartpicker.com/p/3Jdgn
and if the motherboard I have allows it, I'll need a video card and a processor. I have a power supply and a DVD drive as I keep saying
I'd personally recommend an i3 + GTX 750 Ti (best damn budget card out there) since it can do "decent" performance for generally office stuff and even some games, even if you have to turn down the settings a bit.
i3-4130 is around $120, and GTX 750 Ti is around $150, but its well worth it for the power it holds in that tiny card. Seriously, look at its benchmarks. Its a beast.
Since the CPU and GPU are generally the most expensive parts in a custom build, you wont have to worry about dropping that kind of money after getting these two.