Vertical Bi-amp using 2 power amps v mono blocks


I am currently using ARC LS15 preamp, into pair of Audiolab 8000P SS(100w/ch), in a vertical bi-amp configuration.
I am looking at possible upgrades to this. Classe CA100 x2, ARC D200/D130 x2, or maybe use a pair of mono blocks and single wire with jumpers.
Suggestions for either bi-amp or mono block amps that I should be considering. I want to run SS for amps, not tube, although I have toyed with the idea of something like the ARC VT100 mkI, or mkII. This needs to be a worthwhle upgrade to the Audiolabs, and has a budget of $1500-$2000. Will be looking at used equipment
miketw

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