Depends a whole lot on what you plan on doing with the new collection you would get.
Well obviously, but in what mode?
It's virtually up to you, I've never been a fan of buying the cheapest cards just to improve my collection.
If I was you, I might buy 2 or 3 decent decks and build your collection around those particular clans.
Get a good DT deck, then get moneyz and make a good ELO deck, then get good at ELO and make an alternative deck to use if the main one has cards b&, then winrar
Ok I want to probably do a death match to begin with