We have had tremendous success and great feedback from several customers we have sold HP ProBooks and EliteBooks to. These are the upper end of the HP business line of notebooks.
After seeing way too many consumer-grade laptops from every brand name out there come in after a single year of use with multiple hardware issues, I just can't recommend to anyone at all those kinds of computers. They are just built too cheap because everyone and their mailman wants a throw away computer: And that's just what they are, something worth throwing away.
If you're going to do any kind of design work with Adobe, you're run-of-the-mill regular laptop off the shelf from Walmart or Best Buy is barely going to muster up the power to do what you need, and especially will not hold on for several years down the road. I'd highly recommend investing your money wisely in a performance business class notebook: In the end, it's not going to cost you much more than an upper-end consumer notebook, but you're going to probably get a 3-year warranty under the business side of the company (which is infinitely easier to deal with than the consumer side of any big name manufacturer out there) and will be getting a much higher quality computer built to last for years.
Now, with HP their mid-range business line is the HP ProBook. You can find these anywhere from $500 up to $1,200 with a vast option of configurations and performance capabilities in that range. If you've got the money, though, then for a design system I'd have to recommend the HP EliteBooks, their top-tier laptops. I've had the pleasure of ordering and handing several of these beauties out to customers and they have received more praise than most any of our computers. These laptops range from $1,000 and up as far as you're willing to spend, but their performance in design work is unparalleled.
Now, at this point, I get a lot of businesses that ask why HP and not Dell. First off, for their business line of products, HP still holds the upper hand when it comes to build quality, without a doubt. Most all of their lines are constructed of solid aluminum unibody builds and still sell at a lower price than equally-configured Dell Precision and Latitude laptops. In fact, most all major technology reviewers and publications online who have had the chance to review the HP EliteBook laptops put their build quality and price for performance WAY above Mac computers.
It would help for us to know a little more about what you are looking for in a computer, especially what kind of budget you have in mind for this computer. Newegg carries several of the HP ProBook/EliteBook options for a great price, but I know that if you sometimes call directly into HP after doing some price comparisons around you can get a sweet discount deal off just for having called directly in to them.
Let me know some more about what you are looking for and I can narrow down your options a little further if you'd like! I definitely stand behind these HP laptops, I have not been disappointed or had any problems with a single one of the dozens and dozens that we have ordered for customers.