While it is true that you generally get what you pay for when it comes to running gear, it is not necessary to buy the most expensive shirt you find. You need to consider what your wants and needs are and get the best shirt you can find that meets those needs. If you are a casual runner then a mid-range priced shirt will likely meet your needs and give you the quality you are looking for. However, if you are running every day or run in competitions and long distance runs you will likely need a shirt of a higher caliper. So thinking about what your unique situation is will help you determine how much you should spend to get a Nike running shirt that will meet your wants and needs.