The case I linked is very well constructed, to a point that even the 5.25" bays are constructed of the same gauge steel that the rest of the case is. And there is more space than my Chemning Full ATX tower. The case also includes a support bar across the middle (side to side) with adjustable "arms" with rubber padding to secure your PCI/AGP cards, so if you do move around alot, your cards won't shimmy loose. The biggest beef with the case anyone has had is the limited space for harddrives. The harddrives, according to the manufacturer, are to be mounted in the 5.25 bays, obviously this poses a problem if you are running to rom drives and have two harddrives, but there is more than enough room in the front of the case (behind the twin 120mm mounts on the front panel) to mount a HD rack (similar to the ones in my chemning tower) All in all, if you utilized that space, you could mount 6+ more harddrives, and the only "work" needed would be to drill a couple of guide holes in the bottom and screw in the HD mount.
I took my case a step further and added isolation matting, rubber gaskets (silencers) on the PSU, 40mm and 120mm fans and it's surprisingly quiet. The airflow is also pretty nice, with 2 120mm in the front, 2 40mm on the back and 2 80mm on the top. No complaints from me.
P.S. from my list, Take out the 6600GT and replace with an average card and your price will shrink just a tad.
EDIT - Also, keep in mind, this is a 4U Case. By today's standards, the smaller units are selling for more, because that's what people are wanting, less space, etc. For comparison, look up a 2U, 3U and 4U, all made by the same manufacturer, you'll find that the less spaces it takes up, the more it will cost.