My personal favorite: Rosewill RSV-R4000 Black 1.0mm SECC, 4U Rackmount Server Chassis 8 Internal Bays, 4 Included Cooling Fans
You can take the rack handles off and mount it vertically if you so desired. It holds IcyDock's just fine, and you can mount them horizontally or vertically. I replaced my CM 590 with this, and couldn't be happier.