Marelli Digiplex issues

I believe one of my boxes has issues. I've searched the threads and I'm still a little confused with the other ignition system choices. If I were to upgrade to more reliable systems; which is the easiest and affordable to install? I've done the easier stuff like upgrading to Birdman's fuse-block but is this too advance for me to work on? I honestly don't know what I even completely need.