David Morgan, publisher of Silver Investor, likes the balanced risk and growth that midtier companies provide, but even he can't resist the pull of having a speculative pick pay off. In this exclusive interview with The Gold Report, Morgan talks about the tenets he lives by when investing in mining companies, be they small-cap or midtier or billion dollar companies. The Gold Report: David, in August you predicted that the silver price could go as high as $75 an ounce (oz). It was recently…