BLACK STAR
(Ph. Martin's)
The coolest named ink around, also has the best opacity and a nice matte surface. A big problem, however, is that it clings to pen nibs no matter how fast you wash them off after finishing, and has a slightly grainy feel because of the high carbon. The glass bottle is also impossible to get a pen in, but then again this is really intended for technical pens anyway. Use it to feel cool and have the snazzy bottle but be prepared to go through pens at a fast clip.
JAPANESE MANGA INK
(many manufacturers)
Most Japanese inks intended for manga are excellent, great consistency and strength. Have to be careful as some are water-soluble, but another plus is they come in easy to use bottles with wide openings for the pen(almost every brand). No more mystery dipping and coming up with ink-covered pen stocks.
to be added:...hmmm....