How about XMR and LTC , I'm waiting for graphic card and mining some altcoin , maybe zec, xmr , just for long term holding for good price
Investing money into XMR is really risky considering how many people are dumping the coin for another altcoin. I would use a bunch of caution when trying to invest in that coin, although their development team might be pretty good they need to work on stabilizing their coins price because that is what could hurt their project.
Litecoin is at a high price as well, I am not so sure if I'd want to invest in it right this second.