The Sig-S RDA is a fantastic RDA to get started with or as a backup dripper for tasting new flavors.
This RDA is made of 304 stainless steel, is 22mm, and looks flawless on a variety of mechanical mods. It features a copper contact for far less voltage drop, a pair of 2mm air holes, and comes in a brushed finish. The Sig-S has a 3 post design with large post holes for thicker wire, and they are internally insulated with Delrin so you can tighten the large Phillips head screws down without snapping your wire. All in all, you could not ask for a better rebuildable atomizer for the price.