Boyer's are AOK, seem to do the job nicely imo. You could also consider a Newtronic, they work just as well, though the ignition box is a bit bigger. I have both types on my bikes , 750 & 400 respectively, there's not much to choose between them. Haven't tried a Dyna, yet, but I may do sometime soonish as I gather you can get one with a rev limiter, which could be useful for my 460/4. How' do the prices compare? For reliability, I'd invest most in coils with replaceable HT leads and buy new NGK caps for them.