Good headers for the 4.6l

So far a have down a bassani off road x pipe and a magnaflow magnapack catback, I have been trying to find a good set of headers to replace the manfolds, the FRPP shorties are a good price but, some people have told me they are not worth it, I hear long tubes are the best but how much do I have to modify my x-pipe to get them to fit, plus i was looking at the equal length bassani headers has anybody had a tries with those.
Thanks for the help,
Shawn Skonieczny