If $300 is not an extreme burden for you, I'd give the new amp a try. The fact that you are very happy with the Benchmark doesn't mean you couldn't be "happier".
I'm ecstatic with my B&W 804D3 but would love to hear the new SVS Titans in my system. Just part of my "Explorer" DNA. Also: Pass XA-25, Jadis I50, Wireworld Eclipse 8 speaker cable, Mola-Mola DAC, etc.