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Budget Gaming PC | Hardware Revolution
Just scroll down until you get to the colored chart, it has 3 different tiers of high-performance budget gaming builds. This chart really helped me decide what to buy and where although it also taught me what to look for on items the chart did not list and I ended up just doing my own research and buying items not listed in the chart , almost all items brought me to Newegg. Also go to the top right of page and check out the "The best video cards for your money February 2011" being this item is thee most important and spendy. As for CPU's, there is no reason to go Intel being AMD has the same or near the same performance as Intel chips for a fraction of the cost. The motherboard was the most difficult decision for me being a newbie to raw builds, but it's always a good idea to match your motherboard with a related video card ie-AMD and Radeon go well together for Crossfire(multiple video cards) use where as Nvidia uses SLI multiple card system. One must also think of future add-ons so get a mobo that won't need to be replaced until your next build. As for everything else it's pretty simple, you get the speed and size hard drives you want, the dvd or blu-ray drives you want and so on. The power supply must exceed the total power consumption of your components, a good power calculator to use is
eXtreme Power Supply Calculator
Minus monitor/s, keyboard/mouse and sound system a cool grand should get you a great system to build. As for cases just do some math, get the dimensions of the case, video card, any cpu cooler as these items usually have a tight fit, even some larger power supplies. As for cooling forget about liquid solutions unless you're just grabbing a Corsair H50 or something basic and similar for the cpu, unless you're a top extreme gamer a 3-6 fan setup will suffice.
Good Luck.