Paul if you select the "headphones" button on the left side you'll go to the page which shows all of their versions. The Optima line is the series, not a particular model. They have a second button on the homepage labeled "Optima" which outlines the series features and includes a few photos (albeit pretty crappy ones).
I have a set of Original Gray Ghosts. I was initially looking for a dual volume knob model but found a really great deal on a set of single knob originals. I have some hearing loss in one ear and was worried it would be harder to use them with just one main volume control. I can tell you it hasn't been an issue at all! They are very clear, comfortable and pretty light weight for their size. There are lower profile headsets out there as well as even bigger ones, but overall I'm extremely pleased with my GG originals!