You have a micro ATX motherboard and an ATX case. It says it's compatible but you will be happier with a real ATX motherboard instead of the little dinky micro-ATX. Rule of thumb: spend a little extra on the motherboard because it's the worst thing to have to replace (everything has to come out and back in)... so buy a decent one. Personally, I'd never buy anything without hardware RAID on it... but I like RAID0 for some systems.
Ugh... and unless you want your machine to be as slow as a dog, never ever buy a 5400 RPM hard drive. 7200 RPM makes such a huge difference for everything... putting 5400 in is like soaking the whole thing in molasses. I wouldn't even recommend it for business machines. Everything about windows just slows down when the hard drive is slow.
Don't skimp on the power supply. Buy an Antec or something name brand... do the research.
And I agree with Sean re: the embedded graphics. Unless it's just for surfing the internet and reading e-mail.
Really, if you want to build your own machine as cheap as possible and have it also be decent then you are going to have to be a lot more educated than the average consumer. I'd recommend spending lots of time on sites like Tom's hardware (
http://www.tomshardware.com/) until the trade offs of one approach versus another make some sense.
The education is less critical if money is less of an issue because you can just buy on a specific point in the price curve and trust the market to have settled out properly. It's not always right but it's usually right enough not to matter.
No one asked but here is my general theory on that...
Most of us don't really buy technically, we rent a position on the price/performance curve. It looks something like this:
For most things, as the performance increases the price goes up gradually until the point it starts to jump, double, and more. CPUs are the best example of this as often the top performing CPUs are up to twice or four times the amount of the next lower price point.
Anyway, as time moves on, things higher on the curve most down the curve. This is inevitable and unending. The $2000 CPUs of a decade ago are near worthless at this point.
If you buy near the green price point then you get to keep your level on the curve longer and it's often only a little more than the red marker level.
The other thing is that time will wash out bad products down the curve faster (usually) and many things will have different models that span the curve from the red to green markers. This means that if you can find something at the red level that's been around for a while and there is a model, same brand, same series up near the green level then often it is not only going to keep you on the curve longer but will likely not end up being a lemon. (Intel graphics cards are almost the exception that proves the rule though the newer ones are much better... intel has brand recognition that keeps crap around longer than it should be.)
A lot of times you can go to sections or pricewatch.com and just imagine how this curve lays out:
http://www.pricewatch.com/price/video_cards/brand,evga
