Right back at you. We tried out a Dell server at work (2650 iirc). It crashed 3 times during the install (kickstart), and then within an hour of putting any load on it. Needless to say, the server only stayed in the rack for about 2 days before we shipped it back.

The IBM xSeries, OTOH, perform flawlessly for us.

So from my POV, the Dells are cheaper, but they're also less expensive. :)

IMO, get the vendors to give you a test box and play with them. Go from there.