I recently used Dell to provide my replacement Laptop and with the terms available on their special offers at the time of purchase, there wasn't anybody capable of touching the spec/price combination. So it is possible to get Dell barguins and advising people to look at them isn't misleading.
In all purchases I advise people:-
First and foremost, do your research, decide what you want/need, never ever let the salesman tell you. Remember their job is to make you spend as much money as possible.
Never to get hung up on any one brand. The PC market is a cutthroat business and there is always an alternative.
If you want a warranty OK but read the smallprint, make sure it does what you want it to. What exactly are the company commiting themselves to in their terms of service? If you don't want one, decline the sales people can't make you sign.