Here are the specs for the unit:

http://www.apcc.com/resource/include/techspec_index.cfm?base_sku=SU3000RMJ3U

Is this a good one?

I was wrong about the weight, it's not 60lbs, it's 75lbs and that's without the batteries.

The specs say:

Audible noise at 1 meter from surface of unit 47 dBA

I don't know how to measure the noise of my toroidal hum, but I'm guessing it's less than this.

John