bi-am vs better monoblock?


I have old school Infinity Kappa 8.1 vII's which are very powerhungry speakers. I have a adcom gfa-5500 that use to power these speakers & they were never enough for my liking. My fiance just moved in so I used her parasound hca-1500's on my kappa's & since she had enough I bi-amped the speakers. Definantly a HUGE improvement over the Adcom...... I still wouldn't mind a little more power so I was wondering that if I do go with better amps am I better off bi-amping these again (or keep them the way they are) or should I go with something like a 600w bryston amp or something else similar?

Definantly a huge improvement from adcom to 2 parasound amps.... would I get a similar improvement going from parasound to bryston/ whatever amp ??
128x128viggen900
I think the Parasounds should be bridgeable...if you have two of them, try that and see what the speakers do with the 400 or so watts per side. Other than that, most of the time I think the better approach is one better amp rather than bi-amping with two lesser ones, so if Brystons (or Krell, McKormack, etc.) are in your price range...go for it, but they may be overkill for those speakers.
If you like the Parasound HCA 1500 then I recommend getting the Parasound Halo JC-1 mono's a huge step from HCA series.
You might want to look for a used parasound HCA 3500 amp. Its monoblocks in one case, with tons of power and very close in sound quality to the JC1s (JC1s had a more refined treble/upper midrange) But the HCA3500 had better bass/midbass responce. Plus a lot cheaper. I used it for about three years and never had any problems with it. however, over the course of two years with the JC1s i had three break downs.