Does pbmining even have any availability? 

And CEX continues to drop while BTC difficulty continues to rise. 

I continue to think that scrypt mining is the way to go because it minimizes the difficulty increases.  That said, there aren't so many longstanding scrypt cloud mining so you have to give it a try.  I've grown comfortable with scrypt.cc (link below) . . . it's the best payout and passive income on returns that I've found.  If anyone is beating it . . . please let me know.  Thanks.