The Bitcoin Business

The bitcoin business is expanding rapidly now and the individuals that launched in on this business when it first came out are having great rewards from it today. I know a couple of people who are bitcoin billionaires, where they invested when they were teenagers and now that they are adults they are buying their first home and cars using bitcoins. My question to you all is what are some good wallet companies with low fees with a good reputation to purchase bitcoins because the market is expanding rapidly and I am trying to catch the wave?