The only aftermarket brand I really trust is R Axles. http://www.raxles.com/
have found defective rebuilds from other companies that regrind and recycle key parts.
I doubt your noise is from the inner CV. However, another shop may be able to regrease it and replace the boot clamp. The reason they want to replace the axle is that it has to be removed to get at the boot for replacement and the labor is such you may as well replace it.
This link explains how to use CV noises for diagnosis http://www.raxles.com/axleparts.aspx