As I mentioned in a thread similar to this recently, I highly recommend the HP EliteBook series of laptops for any kind of design work. Especially for the price, you cannot beat the EliteBook at any kind of design oriented task with a similarly priced consumer grade laptop. I would never recommend to someone to get a consumer-grade laptop. Owning a computer repair shop personally, the vast majority of computers we get in with problems are just junk laptops. However, in three years time we have sold dozens of HP ProBook and EliteBook laptops and have not had a single one have a single hardware fault yet.
Some of the big differences that set an EliteBook apart:
These are high-durability business-class notebooks. They are built with solid magnesium alloy chassis core, and the frame all around the display panel is solid magnesium alloy to give the most protection possible to your computer during normal travel, wear, and tear. These computers also come with the best performance capabilities possible, with mid to high end Intel processors and professional series graphics cards like the FirePro and nVidia Quadro instead of gaming graphics or even basic integrated graphics which don't perform with near the fidelity and precision as true professional graphics cards.
Additionally, the HP EliteBook series come with a higher quality display panel and support for running multiple external monitors if you need, offering all of the latest connectivity options. The laptops also are highly customizable and upgradable, so you can add up to 16 GB of RAM on some models, 32 GB of RAM in others, as well as options for SSDs, extended batteries, docking stations, and more.
And finally, most of your consumer-grade laptops will only come with a standard 1 year warranty. Most HP EliteBooks come standard with a 3-year next business day top tier business class warranty.
If you want an example of the tested and true nature of the EliteBook, a couple years ago when I went to the ISA convention in Las Vegas most of the vendors running any kind of demonstration, including wide format printers and routers, were using EliteBook laptops for all their work.