This is my first post in the audiophile realm. Having recently received a pair of SVS Ultra Evolution Pinnacle speakers, I need to upgrade from a 25-year old Integra DTR 9.1. Needless to say, exploration of options is overwhelming. Searching locally turned up both the Anthem STR pre-amp and its sister STR amplifier being used as demos in a retail home theater. They are available as discounted items. Additionally, I located a new Marantz PM10 integrated amp, less power but also discounted and costing less overall. So what would be the better acquisiton? What are the caveats with demo amps/pre-amps?Obviously, the speakers can accept quite a bit of power. I do want to add a music streamer as well - another deep pool of options. Any advice would be appreciated, even a left turn from the two suggestions I have submitted. Thanks.