So for my birthday my parents are basically letting me get a large amount of "something", and since I can't think of anything better to get I decided to get some Pokemon cards. I imagine I can spend around $200-250 or so on cards, and preferably they should be all from the same place (one website). I have a fairly random collection right now (Roseanne's, Bebes, Lux Balls, Ebelts, and a few singles of random good cards like Gyarados and Garchomp X), so I don't know what to add onto that.
I know I want to buy cards that will still be legal when the format changes in like a week (so no GE or anything). I also don't know how much to spend on singles (Azelf / Uxie) and how much to spend on boxes / tins / packs. So, some recommendations would be nice.
If you had $250 to spend on cards to boost a collection, what would you buy?