Before you go down this route, make absolutely sure you have planned for the heat/noise/power impact, I say this as someone with a full size half rack on the top floor of three, you don't want to know how heavy it is or what it took me to be able to get it up those stairs, let alone the chassis/rail bill or how much the AC cost or the ongoing running costs of everything.
In terms of racks, I like the older Compaq/HP/Dell style stuff personally, nice and substantial, but they're 24U half racks usually, the Startech stuff is basically budget and 12U, it's adequate, the down side is it's totally open. Depending on the depth required, the wall mounted comms cabinets are often sold as server racks, a half depth chassis may work.
