I had the RB-1090 and liked it a lot when I had a large room and speakers that benefitted from a ton of power (PSB Stratus Goldi, Revel F30). One thing though, you mention a better preamp with balanced outputs but the RB-1090 is not a balanced amp even though it has XLR connections and claims to be a "balanced design". Same thing goes for the matching RC-1090 preamp. The XLR inputs and outputs are converted to single ended inside. It wasn't important to me and I still thought they were a great combo.
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