Welcome to the site!!
Your tank size is a tricky size for HOB skimmers....usually the HOB skimmers are rated UP TO 75 gallons only or less....and usually its ratings is for a very low stock tank..
Only one i can think of is like Aqua C Remora Pro:
http://www.jlaquatics.com/product/ps...n+Skimmer.html
Even though many may say the Aqua C Remora is quiet, to me its nothing but quiet...its quite loud due to the injection method, its effective, but louder...
Depending on your budget... the Deltec HOB skimmers are one of the best, but also $$:
http://www.jlaquatics.com/product/DD...n+Skimmer.html
The Deltec is one of the best skimmers and its quiet....
Do you want to try a "in-tank" skimmer like the Tunze that are really RELIABLE... but they are a bit more $$ and are inside the tank. But a tank you size shouldn't be an issue for room in the tank.
I got the smaller Tunze 9002 in my small 20 gallon tank...and it doesn't take up too much room.
For 75 gallons you might look into the Tunze 9005, its really good and quiet as well:
http://www.jlaquatics.com/product/tz...er+-+9005.html