I work with Dell Lattitude C800-C840s all day. My company has over 50 of these laptops. If you get a dell, pay the extra money to get the Gold Support on it. You call in to their support and get through without having to wait more than a few minutes at the longer. Want a new laptop with gold support? Tell them, they'll overnight it to your place the next day. Put your old one in the box, ship it out at no cost to you. Swap your hard drives to keep your information.
I'd go with the wireless onboard. I haven't had a single problem with Dell's gold support, and on the few occasions that i've called their regular support, I haven't had any problems. Just tell them what you want and they'll ship it to you. When hard drives go bad because people here drop their laptops, I just ask and I receive. A BIG perk is the fact that you can pay an additional 100 dollars or so for a form of insurance on it. Get mad and throw your laptop out an 8 story building and destroy it? tell dell you hated it and want another, they'll ship it overnight. Beat it with a sledge hammer for entertainment? They'll replace it at no cost. Type a lot and wear out the keyboard? Sorry, you'll have to pay for a new keyboard if the warranty is out. haha
Go with Dell, you can't beat it, talk to a rep about their gold support and the extra stuff. They'll probably even give you a good discount on that support.
I highly recommend dells.
Riser