best advise, don't spend the money.
do realize you will end up with a bulk of junk commons.
spending $100+ for 36 rare cards. which for the majority, most only cost a dollar or less each.
the fact of the matter is- you never honestly get back what you spend putting into purchasing a box.
reasons to buy a box:
1.) drafting with friends- "usually helps if everyone chips in"
2.) hosting a private event.. again, helps if participants chip in on the cost.
3.) collecting boxes for future value. some sets are worth holding onto, but takes years . "vault that baby up"
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don't get me wrong, I love cracking those cellophane wrapped lotto tickets too.
but in all serious measures, it's not worth buying boxes for personal use or deck building.