Richard,
I have to agree with everyone here. There are many good choices. I have a Dell XPS at home and Dell in my office (workstations plus server) and have never had a problem.
Customer service can be slow with all, as most of it is based in India (at least when I have called in the past).
Good luck with your purchase. By the way, the Dells, too, are color coded so setup is a breeze.
Anthony