HC-110 because I'm new and had to pick something and it sounded like a good choice. So far so good but since I don't have anything to compare with I have no opinion about how good a choice it was. I've been using dilution D for my 240ml tank and E for my 480ml.

Diafine because it caught my fancy and I was curious about it, and what FP4+ and Acros will look like in it, also for a special project.