Optical Ocean Sales offers a great selection of high-quality Kraken Sports arm packages, that are ready to add on your tray and lights to. Kraken arms and clamps feature hard anodizing that won't scratch and smooth, easily adjustable clamps.
The new Olympus MZ ED 7-14 f/2.8 PRO and MZ ED 8mm FE PRO lenses are very popular. They are sharp, fast, well-made and open up new abilities to shoot underwater in low light (see our reviews here and here). There are a number of ways to house these new lenses depending on how you shoot, or what dome ports and parts you might already own.