I have a dell M1730, which cost an awful lot (as it was the highest spec), and I have to tell you, it's damn heavy!
I use it a desktop replacement that I can take to and from work, as that only involves a bit of movement each day, but it's certainly not cut out for being on the go, weighing a lot, being massive (17" screen) and having very poor battery life. It does nicely double as a heater in cold rooms though!
If you want decent graphics at a reasonable price, laptops are not a good bet. Cheap ones have integrated, non-upgradeable cards that are useless at 3D graphics, and you have to pay a large premium for high quality cards, such as a SLI setup (which also means you are likely to have to use hacked drivers if you want to upgrade, when on a laptop).
If you don't need any portability, get a desktop, which will have the best performance/price ratio.
If you need a bit of portability, such as being able to move a computer relatively easy from one static location to another, a desktop-replacement laptop is good. You can get similar performance to desktop machines, but at a heavy premium.
If you need lots of portability then forget high performance, as high performance demands a lot of cooling, large amounts of power, and will require bulky machines and eat through battery life.
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