Frugal spending for avionics upgrades is ancient history. Here are our top picks for single-system upgrades that score big on value for the investment.

By Larry Ansiglisano

A casual stroll through a modern avionics shop can be as dangerous as a Harley-Davidson fanatic visiting the accessory department at the dealership. It’s easy to grin like a kid and convince yourself that you need one of each.

To keep the lust factor in check, you’ll need to prioritize and decide which new gear will offer the most utility given the investment. …