The first rule of Bitcoin Mining Club is...you don't talk about Bitcoin Mining Club!
No, seriously, if you have to ask yourself if you're in it for ROI profit, or strictly as a learning hobby.
ROI, you seriously need one of these:
You have $425K, easy peezy, PROFIT!!!
https://bitmaintech.com/productDetail.htm?pid=000201412171033028658LE40FU705EDMake sure you live in Antarctica, get solar and wind power, and get cooling from the South Pole freezing air first.
If you're just looking to putz around and play around with Bitcoin mining for shits and giggles, then just get a used Antminer S3.
Good luck!