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I heard that v10s come from the factory with pretty good airflow. Don't expect much improvement in hp or mpg with upgrades. I would love to hear different, but haven't.
I haven't done much reading on what kind of gains you would have, but I know I wouldn't touch the $150 headers. I'm sure they are crap and won't last long. Check out Gibson or JBA, I think they both have headers that are decent.
Last fall I tackled the exhaust manifold stud problem and decided to try the ebay headers at the same time. The driver's side fit perfect but the passenger side was going to require notching the frame. I wasn't willing to cut my frame and went back to the factory manifolds. The guy did refund me after I shipped them back. I did some searches after and it appears this has been a problem for a few people but not everyone - not sure what the differences are in the headers so just be aware.