I'm going to throw another option out there.... Rohrer & Klingner. Leipzeiger Schwarz is their black ink and should fit the bill for what you are looking for. Unfortunately, this is one that I do not own. I do however, have 5 of their other offerings and all are fantastic. Good color saturation, well behaved in my experience, and fairly quick drying (both the regular and iron gall offerings). For deep/dark colors, they make my favorite blue/black in Salix and a wonderful purplish-black in Alt-Bordeaux.