Great choice! EchoBoy is certainly a swiss-army delay. It's super versatile, with lots of options to tweak under the hood. And if you feel intimidated by all those options, you can always use the simpler EchoBoy Jr., which is included when you purchase EchoBoy.
If you find that you enjoy messing around with delays (as so many of us do), you should also consider buying ValhallaDelay. The streamlined design and particular tonal qualities of the different delay modes (and the awesome-sounding diffusion) make this plugin really special.
There are also many 'character' delay plugins that focus on emulating specific hardware delays, or doing some specific delay styles really well. Once you become well-acquainted with your workhorse delay(s), you may want to check some of those out.