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This is a Carver forum, so how about an M1.0 non-inverting version, with appropriate mods? I'm thinking a TFM 42, TFM 45, or TFM 55 would also work. The M1.0 inverting style, and the M500 invert one channel, so they're not compatible. Any "bridged" or "Balanced" amplifier is also not compatible. I'm using an Aragon 8008BB, but with a 12-guage jumper wire between the negative terminals to provide "true" common-grounding. The 8008 on it's own has 20 ohms of resistance between the negative terminals, and it makes the 1Bs sound TERRIBLE. While I hardly think of it as an "upgrade", I have a freshly recapped 55x that's just collecting dust - if you want to switch it out, I'll trade you straight across for the 500t mkII, Bryan... You decide - no pressure;-)

There are a pair of ten-ohm resistors between the negative terminals and chassis ground. From one terminal, through both resistors, to the other terminal is 20 ohms. This is not a floating-ground system, it's more like a "semi-common-ground" arrangement. Other manufacturers do the same thing, perhaps with different-value resistors. Adcom has an amp that has 100 ohm resistor pairs, 200 ohms from one post to the other. I seem to remember something about Parasound having similar resistors. This is--apparently--some kind of "safety" deal. I don't claim to understand it. I just know that my Aragon/Polk system was UN-LISTENABLE before I slapped the jumper wire in place.