Some people are going to recommend you get some kind of beefy gaming laptop to do this on. Unusually for this forum (:P) you're actually in the market for a CAD machine it sounds like. There are two big names in the CAD business, NVIDIA Quadro (and/or TESLA) and AMD FirePro.
On the flip side if you're going to be gaming, business/CAD oriented GPUs aren't as good as gaming oriented GPUs.
so the question really, is what do you want it to be best at. CAD-capable with good gaming ability, or gaming-oriented with some CAD capability?
For a business/engineering oriented laptop, with a good warranty and decent spec, you'd be looking at something like this:-
One of my clients is a CAD firm that design streets for TFL. They swear by these.
Or on the other side, you could look at the more powerful custom-built SCAN 3XS laptops.
You'll probably notice both being pretty similar for CAD (though the Dell will inevitably be faster since the FirePro in it is specifically designed for that kind of job). However the 3XS model there blows it out of the water in terms of ability to game and value for money.
If your budget is stretchy and you don't mind the bulk, there is also a 17" version of the 3XS high end gaming range that carries a beefier GPU.