I have been playing a lot of the Attack of the B-Team pack, and it is amazing. In such a short time, the technic people have assembled an amazing pack. However, I think it can be better. Certain mods would really add to the gameplay. These mods are: (Feel free to add more in comments)
Thaumcraft 3
Industrial Craft 2 (with add ons)
Twilight Forest (maybe)
Divine RPG
Mysticraft (maybe)
Flans Vehicle Pack and other add ons
These are just the mods I thought of, feel free to post other mods you think would be good in comments. If you are a technic pack developer reading this, please add these mods, and keep up the amazing work!