Save up a little more and try to get a good used solid state amp from Ayre, Bat, ARC, CJ, Pass Aleph. Anything from that list will be clearly better than what you are now looking at.
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I briefly had the RB1070 in my system and could not wait to get rid of it. I dislike that sterile, lifeless sound. It had no "balls" whatsoever. I went a week or two without turning on my system. Hated it. I used it to temporarily replace another older amp that started acting up, and got it as a hand-me-down so fortunately, no money lost.
The Nak PA-5 was originally a Nelson Pass Stasis design (same as the Threshold S-series power amps). Properly maintained (it would need a cap upgrade by now), it would be a good bet. The "II" version is still basically the same but has had a couple of minor modifications done by Nakamichi. The PA-7 is even nicer but you're looking at $750 or more for a clean example. It runs on the warm side, but easily drove any speaker I threw at it.
Not going to be extra money to move up. Not a big fan of separates to begin with. More cables more comparing NO. I agree about synergy but the RB 1070 seems to be an issue. Had a 990 for 6 years. I think their best sounding amp may be the 981. Would rweally like to stay with an integrated but $600 to $700 used buys 90 to 100 per side and may or may not sound better. The question still remains for now Nak or Belles. Maybe should go back to B&K Reference 5 tuner preamp and a 4420?