Instructions
Think about what the main purpose of your Swiss Army knife will be. If you are going to use it primarily for the outdoors you might want to consider getting a Swiss Army knife with features like multiple knife blades, a fish scaler or a small wood saw.
Spend a few extra dollars for a trusted brand. Victorinox and Wenger are two highly-rated companies that produce Swiss Army knives. Quality matters with this product, and it is a good investment to buy one from a reputable company.
Look at their specialized models that have titles that relate to the profession or hobby that it was created for. For example Victorinox's CyberTool was created for the computer technicians in mind, and has a USB drive as one of its perks.
Refrain from purchasing unnecessary features on your Swiss Army knife, since the whole point of the knife is that it is meant to be portable. Another downside to having too many features on your model is that you may have trouble finding the one you need when the time arises.