Right, CPU mined coins are definitely the way to go. But you should dump them right a way once they are mined.
Altcoins tend to have short life.
Of course, this can backfire too. Those who mined Dogecoin in the first few days after launch or Darkcoin back when it was worth pennies would have made a very nice return on their investment if they had simply held onto their coins.
Why not just focus all that power on Seti@home? or even better the other one, the protein folder one, forgot the name.
You're probably thinking of either Rosetta@home or more likely, Folding@home. SETI@home is a BOINC project so you would be able to mine Gridcoin at the same time. For a list of BOINC projects, click
here and scroll down to the bottom of the page.