I know about 5 guys who have bought Dell laptops ranging from 9800pro to the 7800 Geforce. E1505, E1705, etc. all work great and no problems. I think they make good laptops to for the price. You can get what you want and how you want it and hardcore XPS if you want. You save $ over Alienware etc. (even though Alienware is a sellout to Dell).
Systemmax makes some good systems too but they're not as configure happy as Dell (although they are going to be in the future)