Don't do it dude.
I'm not trying to troll you, this are my ideas.
I want to do a start-up and ASAP are usually terms that together don't usually work together.
If you are a rich guy that won't mind to lose 50k, do it, but it will be a gamble, a bet, a game that maybe, rarely, eventually will end up in a business. But it won't be a business for a while.
By your words I think this is a decision made very quickly, think twice.
Ok I'll stop being old.
Do what ever you want to do but what I got from your post is that you saw how crazy btc got this week and you have a bunch of cash and thought on mining If I have that amount of cash I'll think on trading just sounds way more fun
good luck anyways and don't forget to tell us.