What distributor do you run?
Have you seen the reviews on those ebay spectra distributors?
Amazon.com: Customer reviews: Spectra Premium NS60 Distributor
FBO is a US ignition company online.
I am a distributor for FBO.
Not only are they a US company, but the people there are racers themselves and have excellent warranty service if needed.
Even though I build most of my own stuff, I do use their parts in some cases.