A pack a friend and I created with some of our favorite mods and new ones to try. We were trying to find a pack we liked for a game, and couldn't quite find exactly what we wanted. I said "how hard could it be" and it really wasn't too bad.
We've played many fun packs that use Thaumcraft, so we have that as well as several expansion. I've also been interested in learning OpenComputers so that's a big one. Aside from that we've pulled some of other fun mods together such as Archimedes' Ships, Ars Magica 2, and Applied Energistics. The end goal for us is to do a large map building project, so we also have Buildcraft and Thermal Expansion and Magical Crops in order to make some resource gathering easier. Other than that, we've peppered in quality of life kinds of mods such as NEI, WAILA, and JourneyMap.
TL;DR: Some fun magic and tech progressions to explore, with helpful systems for automating and resource gathering.
Full List (Not including required libraries or compatibility modules):
NOTE: Version names are nearly complete nonsense. Newer versions will be bigger decimal numbers. I have zero idea how people who make computer things actually name versions, so I'm just making up numbers :3