I definitely think a ST-70 is the way to go, but I'm biased as I'm still using two of them. If you go that route, it's also a great introduction into the world of modification/DIY. If you find one for cheap with the original circuit, the bass response improves dramatically by simply adding capacitance (in the right spot). Good luck with the search.
You might be able to find an ARC classic 30 near that price or $700ish. I enjoyed having that amp for years and played fairly loudly with Pro Ac response 2s. ss
I would look at the rebuilt classic amps on the Mapleshade site if you are looking for an integrated amp; may run a little more but would be worth it. In new amps Chinese would be about the only choice and I have heard conflicting things about their reliability.
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