What is the best laptop for gaming?

I just recently broke my laptop, and I need a new one. The old one was my first laptop, and I've gotten so used to laptops that I don't think I could use a desktop anymore.So, what I need is something that is high on memory, can easily run games like World of Warcraft on the highest possible settings, and can have multiple tabs open without crippling lag. I would prefer HP laptop, all the HP computers I've ever owned have always been very reliable and I'd like to stick to one brand, so HP is a plus. But the main thing is the WoW requirements. I know laptops aren't recommended for gaming because of the heating problems, but really I don't see myself ever gaming on a desktop again, so, don't recommend any desktops please.Price range is around $1000. A little over is okay but really I don't want to over do it because I'll probably replace it in a couple of years.

Thanks for any suggestions

HP ProBook 4420s (XT987UT#ABA) NoteBook Intel Core i5 480M(2.66GHz) 14" 4GB Memory DDR3 1066 500GB HDD 7200rpm DVD Super Multi Intel HD Graphics

HP EliteBook 8540w (XT904UT#ABA) Notebook Intel Core i7 640M(2.80GHz) 15.6" 4GB Memory DDR3 1333 320GB HDD 7200rpm DVD Super Multi NVIDIA Quadro FX 880M

HP EliteBook 8740w Notebook Intel Core i7 740QM(1.73GHz) 17.0" Wide UXGA 4GB Memory DDR3 1333 500GB HDD 7200rpm DVD Super Multi NVIDIA Quadro FX 3800M