Bit lost, not sure if your looking for a desktop or laptop now but....
I've been really happy with the last two Alienware computers I've had. Their laptops are a bit chunky but the Dell warranty is brilliant, guy at work had the motherboard changed on a 3 year old Alienware laptop, they came to his house and without quibble just sorted it.
I have this for CAD and its just ridiculous:
Shop all categories on Dell.com. Explore the site map to find deals and learn about laptops, PCaaS, cloud solutions and more.
www.dell.com
By ridiculous I mean that a render which took 25mins on my Xeon workstation laptop (£3.5k 3 years back) takes just over 2mins - the difference in speed for simulations and renders is just bonkers.
The form factor is nice, bit big, quiet - good. They have cheaper versions which for gaming and normal duty look more than good enough.
The laptops are nice too.
Industry leading innovators, Alienware, manufactures the best gaming laptops & desktops that provide users with immersive and exhilarating gaming experience.
www.dell.com
When I looked at building one with a similar spec I couldn't beat the price by enough to justify it and the warranty etc made the decision. We have swapped quite a few CAD machines over from traditional workstations to Alienware and have had zero issues.
Spec wise - for gaming, all I can say is don't get bogged down in the ultimate spec wars, who actually gives a f**k if you get 100fps or 50fps - I doubt you will. If your playing online your broadband will have a far greater impact, great deals to be had by buying the best of the last gen stuff rather than mid range current.