I’m very selective when it comes to adding new companies to my portfolio. Personally, I’m the kind of character who doesn’t like to take on a lot of risk. I prefer to play the slow and steady game, compounding my cash over many years. Thankfully, the FTSE 250 offers a range of great companies for me to consider investing in with this goal in mind. Network International Holdings (LSE:NETW) is listed on the London Stock Exchange, but it generates its revenue from the Middle East and Africa primarily, and much of its executive leadership is from these regions. It offers a full range of payment processing tools, including credit and debit card processing, mobile and online payment services, and merchant acquiring solutions. Over the past three years, it has been growing its earnings at a rate that puts it in the top 5% of 2,000 companies in the software industry. As earnings are one of the core drivers of appreciation in share price, its recent results are promising. However, I’ve noticed that this company doesn’t have a very good balance sheet. The reason I say this is that it has a lot of liabilities. This makes the firm slightly more...