As a normal computer user, I use to keep my i5 PC for mining in free time. I found ROI-coin is the best coin to mine and then traded on exchange after 30 days, the return on ROI-coin is very high and roadmap of the coin looks great.
https://roi-coin.comRoi-coin is fork of Hodlcoin, which is also CPU only..you can check it
http://hodlcoin.com/