PC Advisor is here to help you get a bargain desktop PC for less than £500. Each month we source, test and review hundreds of technology products, bringing you independent reviews of the very best kit you can buy.

Below you'll find invaluable, straightforward buying advice, so you can ask the right questions when you make a purchase. And on the next page we've got in-depth reviews of the very best five desktop PCs you can buy right now without breaking the bank.

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Budget desktop PCs: buying advice

Processor: Intel's Core 2 Duo E8500 is a popular choice at this price point, although slower processors such as the E8400 will still be fast enough for most users. Lower-cost alternatives include the Intel E7000- and E4000-series chips, although these offer weaker performance at any given clock speed.

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Memory: In this Vista-dominated age, 2GB of RAM is a minimum requirement. You may be able to make do with 1GB, but we wouldn't recommend it. The bulk of sub-£500 PCs are now fitted with 4GB.

Make sure you're getting the full benefit of the memory - some onboard graphics controllers use system memory, which will slow things down. Check your motherboard has free memory slots if you plan to upgrade later.

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Storage: You can never have too much storage space. Digital media content such as video and music files will quickly fill a reasonably sized hard drive, so buy the biggest you can. A 320GB drive is a good investment, although hard-drive space is relatively easy to add later.

If you're planning to upgrade hard drives internally, make sure you've got enough free drive bays in your system case.

Look for a DVD drive that can write to the -R/+R formats at 16-speed or better. If you want to copy 8.5GB at once, get a drive that can write to DVD-R DL and +R DL at 12- and eight-speed respectively. Keep an eye out for 22-speed models.

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Flat-panel: PC manufacturers have to make compromises to keep prices down and often start with the monitor. But you don't want to spend all your computing time looking at a poor-quality display.

All the PCs in our chart come with flat-panels. The most common size is 19in - the quality of larger monitors is unlikely to be high at this price. Look for a monitor with a DVI or HDMI digital connector to ensure the best picture quality. Make sure the PC has one too.

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Graphics card: With the best graphics cards retailing for £300 or £400, a sub-£500 PC is unlikely to satisfy a hardcore gamer. Nonetheless, some sub-£500 PCs come with decent cards.

You should be looking for PCs that can produce 50fps if you're going to be playing games - 70fps or 80fps is better still.

Current dollar prices have made it harder to build decent systems for under £500 and this month we're seeing slower graphics cards provided in all the chart systems. The usual 9800 GT and 9600 GT have been replaced by the 9500 GT.

Those in the ATI camp have seen the HD 4670 replaced by the HD 4650, which offers correspondingly lower performance. For nVidia and ATI cards, always look for a 1GB model rather than the 512MB version.

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Sound card and speakers: You're unlikely to get a standalone sound card at this price. Most motherboards have built-in chips that can handle six-channel sound. To get the best out of them, you'll need a 5.1-channel system (five speakers and a subwoofer), but you're unlikely to get surround speakers at this price point.

Even stereo speakers are rare in systems costing less than £500. Prepare to make sacrifices elsewhere if getting standalone speakers is a requirement for you.

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NEXT PAGE: top five budget PC reviews