Hmm... Well, if you are okay with spending the amount of money, I'd say save 40-50$ for the next Epic Bundle Pack that will probably be released in months to come. If you wanna go a little lower, The firezilla 20$ Gift Card is a nice one. For regular crowns on the game, well, that is super hard to say, considering everything there is awesome! But if you want a mount from there, get the new Pegasus's, or try a hand at the Wyvern Pack to see if you're lucky enough to win the Wyvern Mount and clothes!!!