When comparing prices, you must look beyond the sticker cost and evaluate the Frequency Range, Resolution Bandwidth (RBW), and Displayed Average Noise Level (DANL). A wider frequency range (e.g., up to 26.5GHz vs. 3GHz) significantly increases the price. Ensure the unit offers a low DANL (typically <-150 dBm) for detecting weak signals and a fast sweep speed for transient signal analysis. High-end models often include Real-Time Bandwidth (RTBW) capabilities, which justify a higher price point for R&D applications.