In short, you have two regulator choices: a REALLY SOLID time-tested regulator in value priced DGX Gears D6 packages available exclusively at Dive Gear Express and the Deep Six brand Signature (fka Aegaeon) available at the Deep Six Gear website.
The DGX Gears D6 first stage is a proven design and compared to the Deep Six Signature first stage it's a bit larger. The DGX D6 rotating turret won't turn 360 degrees with a hose in all 4 LP ports where the Signature will rotate fully no matter if every LP port is used. The Signature is chromed then PVD coated for greater scratch protection, versus the DGX that is standard chrome. The Signature has a Teflon coated HP poppet and Teflon o-ring in the balance chamber giving increased performance, versus the standard poppet and Viton o-ring in the DGX D6. The Signature has a metal DIN handwheel, versus the DGX D6 high-impact plastic DIN handwheel. The DGX D6 second stage and the Signature second stage are slightly different body shapes. The Signature second stage barrel is Teflon coated over chrome, the DGX D6 only chromed. The Signature has the Deep Six exclusive Turbine Poppet, the DGX D6 does not.
The Signature comes with a special DIN cap that has a spare DIN o-ring in it, the DGX D6 includes a standard DIN cap. The Signature first stage is also available in a native yoke version, the DGX D6 is available with an optional yoke adapter. Other differences are the Signature regulator ships in the Deep Six orange dry box, the DGX D6 regulator offers the optional DGX Tek Regulator Bag. The Signature includes free service parts, the DGX D6 does not include free service parts. The Signature regulator is also eligible for one free periodic maintenance service.