Well, first of all congratulations on that amazing buy!
I think Magicdice isn´t a real option if you are trying to invest that STEEM to make money. The rule of any luck game is "the house always win". So, please avoid it!
If it was me, Powering up would be a no brainer, because you can make a passive income by delegating to other projects and at the same time, it will increase your curation rewards exponentially.
Finally, DrugWars is a viable option, in my opinion, because it as a lot of potential to grow and also pays you daily based on your production. But, I would only invest into it if I really loved the game and was expecting to play it at least for a whole year (I don´t know if that´s the case for you).
Hope this was helpful, when you decide I would love to hear what was your decision. Cheers, Diogo