If you like the occasional cocktail, get yourself some really big ice cubes. They tend to melt slower and, thus, water your drink down less while also providing a nice big chunk of cold.
Better yet, a very large cube of ice will not act as a dam against the side of the glass like a typical ice maker “cube”.
An upgrade over 2″ cubes would be to create 2″+ spheres. Currently, there seem to be two products on the market to do this. Instead of rehashing information, I’ll just post a link to this fantastic weblog with an article that focuses on spherical ice making.
Still… that mechanical engineering is quite drool worthy.