None of my pumps make any noticeable sound - all skimmers make a bit, but I have learned sound is subjective too - I wrote one post after taking all kinds of DB level readings with an expensive sound monitor on the RSM 130D back in 2009.
$$$ are subjective in a hobby... as you know, I like a good value, so it's hard for me to say if it's worth it... what is expensive to one person, is nothing to another, being you have a chiller.
What I would do, is see if any members have any used Sicce ones... I have picked up over the years, spare used pumps from RSM Club members for just shipping cost & like $30 extra - for all pumps - on my 130d & 250
Skimmer pumps are pretty easy to find used, when some members upgrade to other skimmers...