I've owned many Parasound and B&K amps. The only Acurus component I ever owned was an ActI which I liked a lot, except for the fact you needed it to be connected to a monitor in order to tell what mode it was in.
As for amps, I've owned many of the "Ref" series of B&K, and the "HCA" series of Parasound. I had like both and found the Parasound to be somewhat "bassier". The B&K's seem much more neutral. Ultimately I like the B&K better for this reason, though I do wish I still had my Parasound HCA2200 - it's a n excellent and bulletproof high current amp. I still have B&K M200 Sonatas which are about the best amp you can find for the money (or twice the money for that matter).
Finally, my impression is that Acurus equipment is on the same class as B&K and Parasound. If you like your amp, no reason to jump to another brand. OTOH, I've read that Acurus amps are brite, which can't be said about either B&K or Parasound, and some models of B&K are very warm sounding (especially the M200 Sonatas). If you find your sound too brite, B&K would probably cure this.
As for amps, I've owned many of the "Ref" series of B&K, and the "HCA" series of Parasound. I had like both and found the Parasound to be somewhat "bassier". The B&K's seem much more neutral. Ultimately I like the B&K better for this reason, though I do wish I still had my Parasound HCA2200 - it's a n excellent and bulletproof high current amp. I still have B&K M200 Sonatas which are about the best amp you can find for the money (or twice the money for that matter).
Finally, my impression is that Acurus equipment is on the same class as B&K and Parasound. If you like your amp, no reason to jump to another brand. OTOH, I've read that Acurus amps are brite, which can't be said about either B&K or Parasound, and some models of B&K are very warm sounding (especially the M200 Sonatas). If you find your sound too brite, B&K would probably cure this.