....Don't!!
My company recently(less than a year ago) replaced all our computers with Dell and it has been nothing but a nightmare!
Within 3 months 2 of them had to have their motherboards replaced.Thats just the tip of the iceberg.I can't even begin to tell you the numerous "little" problems we have had.You will spend hours on the phone with snotty sarcastic tech support agents ...if you can first figure out how to get to them.
Check out this link if you don't believe me.
http://www.smorgasbord.net/blog/archive/000002.shtml
Rumor has it that they are going bankrupt.