Change the powerhead, not the wife.

I would suggest a Maxi jet, the mini's are good, I've been happy with rio 90's 180's.

If the bubbles hittingthe impeller is more the issue, then try making the orifice of the intake smaller, this will mean many more bubbles that are smaller, thus they make less noice when they hit the impeller.
Alternatively: using a fine air stone to feed the gas into the impeller will reduce the noise to zero.

Regards,
Tom Barr