The Scubapro MK11 R095 regulator combo is a balanced, compact breathing system that is both lightweight as well as low-cost!
Scubapro's MK11 first stage is renowned for being compact, so great for travelling, while still being an excellent breather with options to add a transmitter (2 HP ports) as well as a drysuit hose (4 LP ports). It has a balanced diaphragm (meaning it will breathe the same at different depth levels - no extra effort required) and you have the choice between a DIN or a Yoke configuration!
The second stage is Scubapro's most basic breather and is seen in many rental stations because it's robust, simple, and reliable. It has a classic downstream valve design and a VIVA preset switch to set the regulator to its best pre-tuned setting!