Before doing anything I suggest taking a look at this Dual Xeon monster article.
http://www.techspot.com/review/1155-affordable-dual-xeon-pc/
It looked so good that I've been gathering parts as we speak.
The CPU's are used but 5% of their original price (I bought 2 spares, tey are that cheap)
I built mine with the same parts list, but I substitued a PNY Quadro NVS 510 graphics card instead.
(It does DisplayPort)
http://www.pny.com/nvidia-nvs-510-for-quad-dvi
blueb