Five-baggers in the next six years are possible, even in this richly priced market.Investing is all about putting money to work now that you hope will be worth more later. It's OK to dream big -- say, of a fivefold increase in six years -- but you have to pick the right stocks.What stocks can turn $1,000 today into$5,000 come 2030? Two names I like are Carnival (CCL -0.93%) and Roku (ROKU 0.24%). Let's take a closer look.1. CarnivalYou might think that the world's largest cruise line operator is an odd bet ...