personally i would either go a distro of linux and learn that or win2kpro - personally it is my favorite os and use it on a couple of machines here at home - less overhead and works fine for my needs.
that machine will run good - dual 750s, 1GB of ram - does the m/b support scsi? for some time my wife's machine was a dual 1GHz P3s w/ 512MB ram and a 36GB 10K u320 hdd - very snappy indeed for normal stuff.