I agree with one of the posts above.  XMR or BCN.  For CPU.

And I love how some people tell people that mine with CPUs not to or that you should give up.  I CPU mine daily as well as GPU and ASIC mine.   I mine XMR with CPU and over time the Satoshi that you make does add up.  I take mine and invest in ICOs and sometime double if not triple what I mined.  There for CPU mining can be worth if.  Unless you just plan on mining and selling.   Take the little you get and try the lotto to make a lot.

I hate when people say to give up.

To give you all that think that mining isn't worth it when it comes to CPUs.
I started with only CPU mining.  Even when people said that is wasn't worth it.  I made little satoshi and again invested what i mined.

Today I now sit on over $10k worth of BTC.   And the only investment that I have was The Solar I use to charge my computer.  I turned hardly nothing into something.

So it can be done even with a higher DIFF.  Just wouldn't recommend BTC with CPU.   Takes to long to to earn anything.

OK sorry i went on but I just hate when people say you cant or to give up.