I wouldn’t get too hung up on what springs to use. If you can’t find the exact DG springs you want I can’t imagine you’d be unhappy with any of the name brand choices. It’s rare to see anyone complain about their VWRs, H&Rs, Eibachs, etc. Grab a set that gives about a 1” drop and pair them with Konis or Bilsteins and you’ll have a nice riding, great handling car.
I went with Eibach Pro Kit springs and Koni Sports. I chose the Eibachs because TireRack.com (forum sponsor) had a great price on them bundled with their swaybars. An unexpected bonus with the springs is that Eibach threw in a brand new, matching set of bumpstops for the front and rear that preserves enough suspension travel for a smooth ride, as well as including a new pair of rear dust boots.