Well, broadly speaking, gaming laptops fall into 3 categories:
Option 1 (Price range £600 -£900)
For this, you'll get a laptop with a mid range core 2 duo processor and a single 8600M GT graphics chip. The 8600M GT has enough grunt to play most modern games at low -medium detail at medium resolutions, (eg. 1440 x 900). An example of this kind of laptop is a Dell XPS M1530 or MSI GX600.
Option 2: (Price range £1000 - £1800)
Spending over a grand should get you a laptop with a single 8800mgtx or 9800mgt graphics chip. These chips have 96 shader units and a 256 bit memory interface, and should be able to game at 1680 x 1050 at medium/high detail. An example is the OCUK Ultima Extreme Mobile
Option 3: (£1800 upwards)
If you've got deep pockets, you can get laptops with dual 8800m GTX graphics cards running in SLI. They will be paired with high end dual core or even quad core cpus and come with glossy 17" 1920 x 1200 screens. These are large units and are basically desktop replacements. They will be able to run games as well as a high end desktop can, so that means gaming at 1920 x 1200 and 2560 x 1600 at high detail. An example is the Dell XPS 1730.
In a gaming laptop, the most important thing is the graphics chip. I wouldn't consider anything lower than an 8600GT for gaming. When shopping, be wary, as not all laptops are designed with gaming in mind. E.g some expensive Sony Vaio's only have low end graphics chips, as they are designed with battery life/portability as the main priority.
A bit wordy, but I hope this helps
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