The CDW rep said:
"Is it apple to apples or did xbyte use third party memory and drives? We are dell's largest partner so it should not be a large difference if truly apples to apples."
CDW might be the largest, but they aren't known for passing along good pricing, being very honest and they only deal in new, not refurb. So it is expected that their prices will be way higher.
xByte will use non-Dell parts, but keeps them under warranty. So it remains apples to apples. CDW is just panicking because they want the sale.