Adding Mods to a Modpack (Or finding a diverse modpack)

[Headlessstew]

I'm trying to add Atomic Energy, Mecanism, Modular Power armor, Ars Magika, Buildcraft and other mods to Attack of the B Team (or perhaps another pack) to create a modpack with a strong science element, with weapons/machines etc, along with cool world elements such as Magic Crops, Biomes O' Plenty, Natura etc, and a touch of magic. This question has probably been asked thousands of times, but how would I go about putting additional mods into a modpack? Or, what recommendations do you have for modpacks that encompass this well? Thanks for help/redirecting me/whatever!

[plowmanplow]

There are so many modpacks of varying scope and quality. I would suggest trying a few and seeing if anything strikes your fancy. If you find something close that is reasonably well built it wouldn't be too hard to drop an additional mod or two into the pack.