As we're on the topic of laptops, the one thing people overlook is the build quality.

Most laptops these days can easily run DJ software - especially if not using video.

What is more likely to break is the actual laptop, especially being moved around so much.

Look for a genuine business machine, rather than a consumer one.

As mentioned above, eBay has lost of manufactured units.

I picked up a cheap Dell Latitude laptop off eBay earlier this year for £160. It's a Intel i5 processor with 8gb of ram. I just bought it as cheap laptop to have in the living room (am using it now to write this), but it's surprisingly powerful. It even runs the Adobe Creative Suite quite happily - I can even edit video on it quite happily, which is a good indicator of power. But more importantly, this thing is absolutely solid. Yes, it's chunkier and heavier than most laptops, but I know it won't break easily. So would be a good option for anyone wanting a DJ laptop.