A $50 stock can be more expensive than an $800 stock because the share price means nothing on its own. The relationship of price-to-earnings and net assets is what determines if a stock is over- or under-valued. Companies can keep prices artificially high by never conducting a stock split, yet without having the underlying foundational support. Make no assumptions based on price alone.
If investing in single stocks may be too risky for you, consider investing in good growth stock mutual funds. Mutual funds are a simple, even boring, investment plan, yet they work well for most people. Of course, all investing requires a degree of risk; there really is no sure thing. But mutual funds are a great balance of reasonable risk and excellent returns. They have built-in diversification that will keep you from putting all your eggs in one basket.