I got mine from IKEA. It looks similar to this:
http://www.ikea.com/ca/en/catalog/products/S59853441
I bought the 120cm cabinet and flanked it with the 30cm cabinets on both sides. I opted not to get the sliding doors because I didn't like the look of the hardware that goes across the fronts. So I installed the glossy brown wood grain doors on the 30cm cabinets with hinges and really subtle pulls. I left the center 120cm cabinet open for all my components and future components. I also bought the square chrome legs that have a chrome piece that runs along the bottom of the cabinet.
Overall I am pretty happy with it and I like the clean modern look of it. It allows me to fit all my components in the open shelves and it also lets me throw loose cables, remotes, controllers in the cabinets with the doors keeping everything looking tidy. Unless I buy a much larger TV in the future it will allow me to build up cabinets on the sides and above the TV if I want to.
The only downside was the cabinets don't have holes in the back for cables to run through. So I had to drill them all manually. Also the cabinets themselves are not very deep so I had to carefully plan were to drill my holes so the cable could go straight out instead of snaking behind the component and pushing it out over the line of the shelf. It look a little time and patience but you would never know I had to do it from looking at the front. If anyone is interested I could take a picture and post it.
