Questions about headers and bypass

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Contemplating a set of headers with sport cats to brighten up the coming winter. Hope to soon have a slightly used Fabspeed catback system at my disposal, but I doubt I'll luck into a similar deal on the headers, so...
If I'm laying out top dollar for new headers to pimp my ride, can anybody comment on the NHP headers with sport cats vs the Fabspeed headers with sport cats. They look pretty similar on paper/monitor. The FS unit comes at quite a price premium, does it have any special attributes to warrant this? Internet research hasn't been particularly helpful, other than to confirm the general good regard in which Fabspeed is held.
JD - I know you are quite the fan of the FS product, can you tell me why I should pay so much more for the FS headers as compared to NHP?
Anyone out there with experience, positive or negative, that might inform my decision?
Also, for people who have done this, how high is the likelihood of me shearing off a bolt at the header flange while removing the old headers? Is this job something I should pass off to a "real" mechanic who is prepared to drill and tap if necessary?
Thanks guys.