Ive done a 5 pack server + faction change transfer 2x now.. but just for one team. x8 would be a bit much. Nothing really to add here, its totally up to you.

If you're looking for advice id say either a) Least amount of money spent = transfer a boosting character over and level up 4 new people through dungeon grinding. b) if you want to spend a bit more, just bring one team, whatever you think your "main" cata team will be.

If things are going well and you think youll be around a long time then maybe think about bringing the other groups over (could do it gradually).