While shopping for the best MX goggles, you need to find a pair that will match your needs and preferences, fit perfectly on your face, and boast the features you desire most.
In many cases, you will find that inexpensive options will provide you with adequate protection and comfort including absorbing face foam and high-quality lenses. This way, you should be able to save some money and stick within your budget.
However, if you are an aggressive motocross rider - especially if you compete and race regularly - you might be better off looking for a pricier and feature-laden pair. It may end up fitting your needs better.