Bi-Amping - Best Way?

The following suggestion really depends on the rest of your system (especially the preamp) & the brand of your speakers. It also depends on whether you want to bridge your amps for power or just split them to drive different drivers in your speakers. It is impossible to make suggestions without knowing the brand of the speakers & their crossover layout.

My components are all Classe as follows: CDP-1 CD player, CP-47.5 preamp, & (2) CA-150 amps. I have "temporary" RSL Elan speakers for now, which I run bridged since my present speakers have only (1) input. I am saving $ for Dunlavy SC-IV/A speakers. My preamp has (1) balanced output (which I could split?) & (2) single-ended outputs. What if I were to purchase ProAc Repsonse 5's or B&W Nautilus 802's or Aerial Acoustic 7b's? Would this change the best way to bi-amp? What if I later added (1) or (2) subwoofers such as Velodyne HGS-18's or Bag End S18E's with their ELF-1 "dual-integrator outboard electronic crossover?" the latter requiring at least (1) more amplifier or possibly (2) more CA-150's? Thanks for your suggestions.