Went to Newegg.com as that is where you linked from the first time.
My laptop screen isn't big enough to fit the whole shopping cart in one screen shot so I had to take two shots for you.
For what I through together its about $491 US before shipping and any applicable taxes. You might be able to shave a few more dollars off he and there. These parts also give you the ability to expand down the road...adding a discrete video card, more ram and so on.
Note...this does not include mouse, monitor and keyboard as I am not sure whether you need any of that or not. If you do, it makes it even more difficult to fit a budget that tight.