Budget power meters can be reliable, but it depends on the specific model. Cheaper options may not be as accurate as high-end models, but they can still provide valuable data for training. Look for power meters that use dual-sided measurement for more accurate data. Also, consider factors such as battery life, water resistance, and ease of installation. Brands like Stages and 4iiii offer power meters in your price range. However, keep in mind that power meters are only one tool for improving performance. Proper bike fit and core strength are also crucial for preventing numbness and improving comfort on long rides. Don't let the pursuit of data detract from the importance of these other factors.