Mike,
A 150 WPC and 110 WPC AVR are equivalent power wise.
To get a noticeable output difference compared to a 150 WPC unit; you either have to go down to ~75 WPC or up to ~300 WPC (i e. halve or double the power) to change acoustic output by 3dB.
If the newer AVR has features you would like, $100 is a small risk IMHO.
Cheers,
XEagleDriver
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