Struggling choosing and buying packs (ranking and cheap options)

Can't really be much help with ranking as these are all some of my least favorites, but if you want to save money CDKeys is the best bet. I use it all the time and I've used it for most the packs and never had an issue. I've found that some times they're selling all of the expansions for as little as 10 bucks each so it's definitely worth shopping there rather than paying EA's extortionate prices