We built a mame cabinet at my old work, and it's still there. We went all the way, too. Built the cabinet, complete with T-moulding and plexi drink cover. The only thing we left out was the coin mech. It was just too expensive to justify. At the house I just use a shelf from home depot with 2x4's attached with rubber feet on the bottom. The only problem with that is that it's too light for 2 people to be playing something like Killer Instinct on it. It keeps sliding around. The only bad thing about going the whole cabinet route is the space required and the cost. Total cost BEFORE adding the PC was about $800. Since there were 6 of us going in on it, it wasn't so bad, but I couldn't swallow that alone.

Or you could wimp out and buy one of these.