Oh, so you want to get into PC gaming

To play the latest games with the graphics on high (or ultra) and keep a high frame-rate, you’ll be needing to look into a truly high-performance machine. Modern games take up a lot of space, so a big hard drive is a must if you plan on having more than one game installed at a time — you’ll want it to be a fast drive, too. Running those games also takes a lot of processing power, so a heavy hitting processor will be important. You can do without too many cores in your processor if each is extra fast, but if you’re planning to play your games and keep other programs open in the background, consider bumping up the core count.
Integrated graphics? Forget about it. Unless you want to sputter out low-quality visuals on the newest games, you’ll need a dedicated graphics card, and a good one at that. You can probably get by with something in the mid-range of graphics cards, but a high-end card is your best bet. Be sure to get plenty of VRAM on that card. When it comes down to making your pick, you’ll still probably be best consulting the benchmarks mentioned on the last page.
Thinking about anything other than Windows? Reconsider. Some games are made available for Mac and Linux, but there will be a great number of games unavailable to you if you aren’t running Windows — though there is the tricky option of dual-booting.
Thinking about a laptop? Reconsider again. As mentioned in the beginning, there is a premium to be paid for cramming high-end hardware into an extra small box, and a PC gaming rig requires a lot of high-end hardware. There are plenty of quality gaming laptops out there, but in most instances they will be more expensive than an equal desktop. Then there’s the problem of overheating, which a laptop will be much more prone to do. An added benefit of going with a desktop is that you will be able to swap out components or add more when the games’ demands start to trump your computer — upgrading to a new graphics card is much easier in a desktop, and in some cases a second graphics card can be added to share the load. With a little careful shopping, you might be able to grab a gaming rig and a cheap netbook for the same price you would have paid for a gaming laptop.